Always return failure when we didn't manage to add transitions.

Review URL: https://chromiumcodereview.appspot.com/10704183

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@12063 ce2b1a6d-e550-0410-aec6-3dcde31c8c00

src/isolate.h

@@ -528,6 +528,11 @@ class Isolate {
     thread_local_top_.save_context_ = save;
   }
 
+  // Access to the map of "new Object()".
+  Map* empty_object_map() {
+    return context()->global_context()->object_function()->map();
+  }
+
   // Access to current thread id.
   ThreadId thread_id() { return thread_local_top_.thread_id_; }
   void set_thread_id(ThreadId id) { thread_local_top_.thread_id_ = id; }