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Author SHA1 Message Date
yurys@chromium.org
16bb1dc210 Deprecate some debugger methods 
These methods have been superceeded by equivalents accepting object arguments exposing more details.

BUG=None
R=loislo@chromium.org, yangguo@chromium.org

Review URL: https://codereview.chromium.org/19549002

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@15708 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2013-07-17 09:20:16 +00:00
ulan@chromium.org
b75063bea8 Do not call reinterpret_cast when converting from NULL. 
If NULL is a nullptr (such as on my FreeBSD system), it is not possible to
use reinterpret_cast to convert it to another pointer. Plus, just using NULL
directly achieves the same effect.

R=ulan@chromium.org

Review URL: https://chromiumcodereview.appspot.com/19388005

Patch from Raphael Kubo da Costa <raphael.kubo.da.costa@intel.com>.

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@15705 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2013-07-17 08:46:44 +00:00
mvstanton@chromium.org
4465c83104 Calls to HCheckFunction can be eliminated if the value is an HConstant. 
Reland "Calls to HCheckFunction can be eliminated if the value is an HConstant"
(https://codereview.chromium.org/18751003/).

The CL failed because of heap snapshot issues. alph@chromium.org just checked in
a fix for that (https://code.google.com/p/v8/source/detail?r=15694).

BUG=
R=danno@chromium.org

Review URL: https://codereview.chromium.org/19504007

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@15704 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2013-07-17 08:46:01 +00:00
hpayer@chromium.org
29ad06f684 More aggressively inline optimized code. 
BUG=
R=danno@chromium.org, mstarzinger@chromium.org, titzer@chromium.org

Review URL: https://codereview.chromium.org/19504006

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@15703 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2013-07-17 08:44:10 +00:00
ulan@chromium.org
afa864b822 Enable building for android on x86_64 machines. 
R=ulan@chromium.org
BUG=

Review URL: https://chromiumcodereview.appspot.com/18535011

Patch from Ross McIlroy <rmcilroy@chromium.org>.

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@15702 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2013-07-17 08:37:48 +00:00
bmeurer@chromium.org
a72b5d6c4d Fix invalid array length check in TransitionElementsKindStub. 
The stub used to check the length of the JS array to see if
there's a need to duplicate the elements backing store. This
way it will not duplicate the elements array when going from
double to object even if the elements array is not the empty
fixed array. Later on it will then store pointers into a
FixedDoubleArray.

The native code stub used to check whether elements points to
the empty_fixed_array singleton instead of testing the length.
The Hydrogen stub does that as well now.

R=danno@chromium.org

Review URL: https://codereview.chromium.org/19289009

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@15701 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2013-07-17 08:32:28 +00:00
jkummerow@chromium.org
397163f0c8 Prepare push to trunk. Now working on version 3.20.7. 
R=yangguo@chromium.org

Review URL: https://codereview.chromium.org/19543002

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@15698 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2013-07-17 08:19:34 +00:00
rodolph.perfetta@gmail.com
1248321eb5 ARM: Improve code aging sequence. 
The code aging sequence contains a load which is unecessary for optimised
function. This has been replaced by a nop.

BUG=none
TEST=none

Review URL: https://chromiumcodereview.appspot.com/19379003

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@15697 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2013-07-17 08:09:52 +00:00
svenpanne@chromium.org
0e99e77143 Removed unused HOptimizedGraphBuilder::BuildCallSetter method. 
R=mstarzinger@chromium.org

Review URL: https://codereview.chromium.org/19235011

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@15696 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2013-07-17 08:02:08 +00:00
palfia@homejinni.com
fbb8b84039 MIPS: Fix bug introduced by r15640. 
This bug causes segfault in the octane benchmark,
because the deoptimization entries do not fit in the
deopt table.
This change increases the table entry size.

TEST=octane benchmark

BUG=

Review URL: https://codereview.chromium.org/19381004

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@15695 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2013-07-16 18:02:43 +00:00
alph@chromium.org
09131296ac Add missing links from GlobalPropertyCell to dependent_code 
It produced orphan DependentCode nodes because links were not created explicitly in ExtractPropertyCellReferences and IndexedReferencesExtractor was disabled for ProperyCells.

R=danno@chromium.org, loislo@chromium.org

Review URL: https://codereview.chromium.org/19368002

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@15694 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2013-07-16 17:47:35 +00:00
verwaest@chromium.org
f24a5d3200 Try to remove invalidated stubs before falling back to checking the constant state. 
BUG=chromium:260585
R=hpayer@chromium.org

Review URL: https://chromiumcodereview.appspot.com/19267019

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@15693 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2013-07-16 14:01:46 +00:00
alph@chromium.org
86ca2c133c Make TransitionArray internal references originate from TA in heap snapshot. 
TransitionArray references were added to the TA's map object instead
of TA itself.

R=verwaest@chromium.org, yurys@chromium.org

Review URL: https://codereview.chromium.org/19265002

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@15692 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2013-07-16 12:48:34 +00:00
hpayer@chromium.org
147163fc41 Added mark bit cell iterator. 
BUG=
R=mstarzinger@chromium.org, titzer@chromium.org

Review URL: https://codereview.chromium.org/19182002

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@15691 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2013-07-16 12:14:16 +00:00
machenbach@chromium.org
62df8063a4 Extend expectations for slow test cases on the V8/blink trunk builder. 
The second test has an existing expectation that is extended.

R=jkummerow@chromium.org

Review URL: https://codereview.chromium.org/19299004

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@15690 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2013-07-16 11:21:48 +00:00
yurys@chromium.org
7fee06a6d9 Fix cctest/test-cpu-profiler/FunctionApplySample fakiness on ARM simulator 
For STM and LDM instuctions with writeback update base register only after all registers have been saved/loaded. This guarantees that invariant sp <= fp is always true when iterating stack in the Sampler.

BUG=v8:2782
R=yangguo@chromium.org

Review URL: https://codereview.chromium.org/19243002

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@15687 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2013-07-16 09:34:09 +00:00
hpayer@chromium.org
a65cb03955 Added tracing information to the case when allocation folding cannot be performed. 
BUG=
R=mstarzinger@chromium.org

Review URL: https://codereview.chromium.org/19290008

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@15686 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2013-07-16 08:54:41 +00:00
mstarzinger@chromium.org
f8f5be2366 Minor cleanup of GVN state pushing. 
R=hpayer@chromium.org, hpayer@google.com

Review URL: https://codereview.chromium.org/19235010

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@15685 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2013-07-16 08:37:49 +00:00
dslomov@chromium.org
11a38ed875 Throw if first argument to TypedArray.set is a number. 
Further refinement to semantics that I have missed in previous change.
Both Blink and Firefox are permissive with arguments to .set method.
However, when first argument to "set" is a number, all implementations
throw, so that users know that
   a.set(0,27)
does not assign 27 to 0th element of a, not 0 to 27th element of a.

R=bmeurer@chromium.org

Review URL: https://codereview.chromium.org/19210002

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@15684 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2013-07-16 08:11:30 +00:00
bmeurer@chromium.org
c0637c1828 Use BitVector instead of handcrafted SparseSet. 
R=svenpanne@chromium.org

Review URL: https://codereview.chromium.org/19272011

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@15683 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2013-07-16 07:07:04 +00:00
adamk@chromium.org
fab9f4e126 [Object.observe] Lazily allocate callbackInfo structure 
This patch allows callbacks to lazily allocate the InternalArray which is used to store pendingChangeRecords. This moves some of the expense of observation to the case where changes actually occurred.

When there are no pendingChangeRecords, the callbackInfo structure is a number which is the callbacks priority. Whenever a changeRecord is enqueued to the callback, it "normalizes" to be an InternalArray with a priority property. Immediately before its changeRecords are delivered, it returns to its optimized state.

---
Note: Naming confusion resolved:

This patch corrects some naming confusion in object-observe.js. Previously, we used the terms "callback" and "observer" to mean roughly the same thing, and overloaded the term "observer" to be both the callback itself and the *registration* on a object to observe (which now includes an accept map).

This patch resolves this confusion:

"object" (objectInfo, objectInfoMap): This refers to the observed object and its structures

"callback" (callbackInfo, callbackInfoMap): This refers to the callback to whom change records may be delivered

"observer" (objectInfo.changeObservers): This refers to a registration to observe a given object by a given callback with the specified accept list.
---

R=rossberg@chromium.org

Review URL: https://codereview.chromium.org/19132002

Patch from Rafael Weinstein <rafaelw@chromium.org>.

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@15682 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2013-07-15 22:16:30 +00:00
machenbach@chromium.org
5e343cd2a9 Make deopt testing compatible with runtime optimization status queries. 
When deopt testing is activated, a new status code will be returned by optimization status queries (status=maybe deopted).

This will make those tests work that test for 'not status=no', when performing deopt testing.

R=jkummerow@chromium.org

Review URL: https://codereview.chromium.org/19184002

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@15681 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2013-07-15 18:47:40 +00:00
hpayer@chromium.org
38a87d2c4a Revert r15649 and fix for loop dominator propagation in GVN. 
BUG=
R=mstarzinger@chromium.org

Review URL: https://codereview.chromium.org/19233002

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@15680 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2013-07-15 16:58:20 +00:00
bmeurer@chromium.org
bbb2cf3fac Disable compiled_transitions by default. 
This was accidently re-enabled with r15674.

TBR=danno@chromium.org

Review URL: https://codereview.chromium.org/19229003

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@15679 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2013-07-15 16:56:32 +00:00
machenbach@chromium.org
3e49fb662b Make optimizations for debug configurable with compile flag. 
To turn on optimizations for debug when building standalone, a compiler flag can be used:

make optdebug=on

R=jkummerow@chromium.org

Review URL: https://codereview.chromium.org/19164003

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@15678 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2013-07-15 16:33:06 +00:00
jochen@chromium.org
3f5f455a26 Fix gyp_v8 to work with use_system_icu=1 
If you want to use the system icu library, you'll need to use gyp_v8 (as
opposed to the standalone Makefiles)

BUG=v8:2475
R=jkummerow@chromium.org

Review URL: https://codereview.chromium.org/19195003

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@15677 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2013-07-15 15:41:21 +00:00
danno@chromium.org
5713ca0d8f Revert 15635: Turn ElementsTransitionAndStore stub into a HydrogenCodeStub 
Causes breakage in crypto-(sha1|md5) SunSpider

TBR=bmeurer@chromium.org

Review URL: https://codereview.chromium.org/19214002

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@15674 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2013-07-15 15:23:52 +00:00
mstarzinger@chromium.org
35052bc2ea Reland deprecation of HAllocateObject in favor of HAllocate. 
This essentially relands r14930 and r14935 with adaptions to the current
code base. It models the instantiation of an implicit receiver for
CallNew nodes in hydrogen using HAllocate together with generic stores
instead of one specialized HAllocateObject instruction, hence creating a
single choking point for inlined allocation in optimized code.

R=hpayer@chromium.org

Review URL: https://codereview.chromium.org/19207002

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@15673 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2013-07-15 15:12:16 +00:00
rossberg@chromium.org
db76aa2717 Fix sloppy-mode 'const' under Harmony flag. 
R=yangguo@chromium.org
BUG=173361

Review URL: https://codereview.chromium.org/19199002

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@15670 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2013-07-15 14:12:20 +00:00
jkummerow@chromium.org
8be50bbd70 Fix --deopt-every-n-times flag 
(was broken since r15640)

R=titzer@chromium.org

Review URL: https://codereview.chromium.org/19188002

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@15669 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2013-07-15 13:36:36 +00:00
bmeurer@chromium.org
b43e8f1e66 Android lacks support for cxxabi.h. 
R=jkummerow@chromium.org

Review URL: https://codereview.chromium.org/19153004

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@15666 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2013-07-15 12:24:13 +00:00
mstarzinger@chromium.org
0599225187 Use internal array as API function cache. 
R=yangguo@chromium.org
BUG=chromium:260106
TEST=cctest/test-api/Regress260106

Review URL: https://codereview.chromium.org/19159003

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@15665 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2013-07-15 11:41:41 +00:00
loislo@chromium.org
d13ad5be9b Current logger code is messy. It mixes together 
four or even five different logging destinations.
I think we can extract the code related to a destination
into a separate class, do the same for the all destinations
and have four classes with more or less simple common logging
API

BUG=none
Meta-bug= https://code.google.com/p/chromium/issues/detail?id=260203

R=yangguo@chromium.org, yurys@chromium.org

Review URL: https://codereview.chromium.org/18259024

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@15664 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2013-07-15 11:35:39 +00:00
bmeurer@chromium.org
01080fa7dc Fix possible stack overflow in range analysis. 
Avoid the implicit recursion for range analysis, using a loop with
an explicit stack instead.

BUG=chromium:259452
R=dslomov@chromium.org

Review URL: https://codereview.chromium.org/19145002

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@15661 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2013-07-15 09:53:46 +00:00
bmeurer@chromium.org
fb77805ab7 Turn propagate deoptimizing mark into a proper HPhase. 
Also turn the recursion on the domination chain into a loop with
an explicit stack, to avoid possible stack overflow here.

R=dslomov@chromium.org

Review URL: https://codereview.chromium.org/19150002

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@15660 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2013-07-15 09:53:00 +00:00
dslomov@chromium.org
1c2d005b3c Use corerct conversions for DataView accessors. 
We now use DoubleTo(U)Int32 that follows ES specification.

R=titzer@chromium.org,rossberg@chromium.org

Review URL: https://codereview.chromium.org/18703007

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@15659 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2013-07-15 09:32:15 +00:00
danno@chromium.org
d8b7c721cc Prepare push to trunk. Now working on version 3.20.6. 
R=mstarzinger@chromium.org

Review URL: https://codereview.chromium.org/19154003

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@15656 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2013-07-15 08:00:10 +00:00
dslomov@chromium.org
a6419e3e47 This does not match ES6 spec but is the behavior in both Firefox and WebKit/Blink. 
R=bmeurer@chromium.org

Review URL: https://codereview.chromium.org/19086003

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@15655 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2013-07-15 07:43:46 +00:00
bmeurer@chromium.org
1384094efc Cleanup leftover definitions in HGraph. 
R=danno@chromium.org

Review URL: https://codereview.chromium.org/19154002

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@15654 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2013-07-15 07:41:18 +00:00
danno@chromium.org
c65f4f7f7b Don't use StoreIC_ArrayLength on frozen arrays 
The code previously assumed that an array with fast properties must have
a writable length property. But Object.freeze() now exposes a way to make
length read-only without moving the object into slow mode. This patch
simply adds a !is_frozen check to the IC code. Any future optimizations
to attribute-setting on JSArrays will need to make similar accomodations.

R=danno
BUG=v8:2711,259548

Review URL: https://chromiumcodereview.appspot.com/19115002
Patch from Adam Klein <adamk@chromium.org>.

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@15651 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2013-07-14 22:03:46 +00:00
adamk@chromium.org
625a0e9759 Add map transition for observed objects 
This patch enables objects to undergo a single transition when they become observed, avoiding the need to create a new map for every observed objects.

Observed objects which become unobserved does not cause another map transition and unobserved does not clear the observed bit on the map. The unobserved object.

R=verwaest@chromium.org

Review URL: https://codereview.chromium.org/18221006

Patch from Rafael Weinstein <rafaelw@chromium.org>.

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@15650 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2013-07-13 00:20:40 +00:00
hpayer@chromium.org
f5ab1b2a4a Collect side effects on paths to dominated block including the dominator. 
BUG=
R=danno@chromium.org

Review URL: https://codereview.chromium.org/18254008

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@15649 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2013-07-12 15:06:50 +00:00
danno@chromium.org
4095600a00 Fix windows build breakage due to 15645 
R=ulan@chromium.org

Review URL: https://codereview.chromium.org/18915009

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@15648 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2013-07-12 13:45:41 +00:00
olivf@chromium.org
da7f6a68aa Fix number tag for no-sse2. 
FCmp() pops 2 arguments from the stack...

BUG=
R=mvstanton@chromium.org

Review URL: https://codereview.chromium.org/18254007

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@15647 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2013-07-12 13:05:39 +00:00
danno@chromium.org
5086db3d30 Fix LGapResolver::EmitMove for X64 when the dst is a double register and src is a constant 
R=danno@chromium.org

Review URL: https://codereview.chromium.org/18301015

Patch from Haitao Feng <haitao.feng@intel.com>.

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@15646 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2013-07-12 12:34:11 +00:00
danno@chromium.org
48b65f8cd5 Implement truncated d-to-i as a stub on x86 
- Added a general DoubleToIStub so that it's possible to extend to other platforms and non-truncating case.
- This version handles all cases of truncation (previous code deopted in some cases) and all source/destination register combinations without clobbering any temps.

R=yangguo@chromium.org

Review URL: https://codereview.chromium.org/18612005

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@15645 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2013-07-12 12:28:32 +00:00
bmeurer@chromium.org
4780c99790 Add a common templatized implementation of OS::DumpBacktrace() and OS::StackWalk() to platform-posix.h and use it for Linux, Mac OS X and FreeBSD. 
R=dslomov@chromium.org

Review URL: https://codereview.chromium.org/18431004

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@15644 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2013-07-12 12:02:26 +00:00
yangguo@chromium.org
bd04a838a7 Check for scheduled exceptions after a failed-access-check callback. 
R=verwaest@chromium.org
BUG=v8:2524

Review URL: https://codereview.chromium.org/18298012

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@15643 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2013-07-12 11:42:07 +00:00
yangguo@chromium.org
c28cefce91 Test case for missing access checks in object observe. 
BUG=v8:2778
R=verwaest@chromium.org

Review URL: https://codereview.chromium.org/18794003

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@15642 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2013-07-12 10:11:18 +00:00
yangguo@chromium.org
e002207321 Fall back to generic on access checks in JSON.stringify. 
BUG=259366
R=verwaest@chromium.org

Review URL: https://codereview.chromium.org/18225006

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@15641 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2013-07-12 10:04:35 +00:00