Make proxy fixing GC safe.

src/objects.cc

 // Copyright 2011 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 2314 matching lines @@
   return NONE;
 }
 
 
 void JSProxy::Fix() {
   Isolate* isolate = GetIsolate();
   HandleScope scope(isolate);
   Handle<JSProxy> self(this);
 
   isolate->factory()->BecomeJSObject(self);
-  ASSERT(IsJSObject());
+  ASSERT(self->IsJSObject());
   // TODO(rossberg): recognize function proxies.
 }
 
 
 
 MaybeObject* JSObject::SetPropertyForResult(LookupResult* result,
                                             String* name,
                                             Object* value,
                                             PropertyAttributes attributes,
                                             StrictModeFlag strict_mode) {
@@ skipping 9443 matching lines @@
   if (break_point_objects()->IsUndefined()) return 0;
   // Single beak point.
   if (!break_point_objects()->IsFixedArray()) return 1;
   // Multiple break points.
   return FixedArray::cast(break_point_objects())->length();
 }
 #endif
 
 
 } }  // namespace v8::internal