X87: Remove kind field from StackHandler.

port 15f8213809 (r27263)

original commit message:

 This relands commit 96f79568a9.

 This makes the Isolate::Throw logic not depend on a prediction of
 whether an exception is caught or uncaught. Such a prediction is
 inherently undecidable because a finally block can decide between
 consuming or re-throwing an exception depending on arbitray control
 flow.

 There still is a conservative prediction mechanism in place that
 components like the debugger or tracing can use for reporting.

 With this change we can get rid of the StackHandler::kind field, a
 pre-requisite to do table-based lookups of exception handlers.

BUG=

Review URL: https://codereview.chromium.org/1027413002

Cr-Commit-Position: refs/heads/master@{#27385}

src/x87/macro-assembler-x87.cc

@@ -1002,11 +1002,9 @@ void MacroAssembler::PushTryHandler(StackHandler::Kind kind,
   } else {
     push(esi);
   }
-  // Push the state.
-  unsigned state =
-      StackHandler::IndexField::encode(handler_index) |
-      StackHandler::KindField::encode(kind);
-  push(Immediate(state));
+
+  // Push the index.
+  push(Immediate(handler_index));
 
   // Link the current handler as the next handler.
   ExternalReference handler_address(Isolate::kHandlerAddress, isolate());