Fix debug builds.

TBR=ager@chromium.org

Review URL: http://codereview.chromium.org/1572029

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@4363 ce2b1a6d-e550-0410-aec6-3dcde31c8c00

src/log.cc

@@ -1478,7 +1478,7 @@ bool Logger::Setup() {
     }
   }
 
-  ASSERT(VMState::current_state_ == NULL);  // NULL implies outermost external.
+  ASSERT(VMState::is_outermost_external());
 
   ticker_ = new Ticker(kSamplingIntervalMs);
 

src/vm-state.h

@@ -42,6 +42,11 @@ class VMState BASE_EMBEDDED {
     external_callback_ = external_callback;
   }
 
+  // Used for debug asserts.
+  static bool is_outermost_external() {
+    return current_state_ == NULL;
+  }
+
   static StateTag current_state() {
     return current_state_ ? current_state_->state() : EXTERNAL;
   }