Fix LoadFieldByIndex to take mutable heap-numbers into account.

src/objects.cc

 // Copyright 2013 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 5622 matching lines @@
 }
 
 
 Handle<JSObject> JSObject::Copy(Handle<JSObject> object) {
   Isolate* isolate = object->GetIsolate();
   CALL_HEAP_FUNCTION(isolate,
                      isolate->heap()->CopyJSObject(*object), JSObject);
 }
 
 
+Handle<Object> JSObject::FastPropertyAt(Handle<JSObject> object,
+                                        Representation representation,
+                                        int index) {
+  Isolate* isolate = object->GetIsolate();
+  CALL_HEAP_FUNCTION(isolate,
+                     object->FastPropertyAt(representation, index), Object);
+}
+
+
 template<class ContextObject>
 class JSObjectWalkVisitor {
  public:
   JSObjectWalkVisitor(ContextObject* site_context, bool copying,
                       JSObject::DeepCopyHints hints)
     : site_context_(site_context),
       copying_(copying),
       hints_(hints) {}
 
   Handle<JSObject> StructureWalk(Handle<JSObject> object);
@@ skipping 10779 matching lines @@
 #define ERROR_MESSAGES_TEXTS(C, T) T,
   static const char* error_messages_[] = {
       ERROR_MESSAGES_LIST(ERROR_MESSAGES_TEXTS)
   };
 #undef ERROR_MESSAGES_TEXTS
   return error_messages_[reason];
 }
 
 
 } }  // namespace v8::internal