Enable weak embedded maps in optimized code.

src/isolate.h

Index: src/isolate.h
diff --git a/src/isolate.h b/src/isolate.h
index 76a5a41e70ab0b32502d10a5c9ed37ad22789985..f773ad8dce77659c9a0eefb96025890df444cd28 100644
--- a/src/isolate.h
+++ b/src/isolate.h
@@ -741,6 +741,8 @@ class Isolate {
                                           int limit);
   void CaptureAndSetDetailedStackTrace(Handle<JSObject> error_object);
 
+  StackFrame* TopOptimizedFrame();

[Michael Starzinger, 2013/07/02 14:20:54]

Can we inline this functionality into mark-compact.cc directly to where it's
being used, I think nobody should be tempted to use this.

[ulan, 2013/07/02 14:45:41]

Done.

+
   // Returns if the top context may access the given global object. If
   // the result is false, the pending exception is guaranteed to be
   // set.