Also allow the empty object map to keep transitions.

src/isolate.h

 // Copyright 2012 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 513 matching lines @@
     ASSERT(context == NULL || context->IsContext());
     thread_local_top_.context_ = context;
   }
   Context** context_address() { return &thread_local_top_.context_; }
 
   SaveContext* save_context() {return thread_local_top_.save_context_; }
   void set_save_context(SaveContext* save) {
     thread_local_top_.save_context_ = save;
   }
 
-  // Access to the map of "new Object()".
-  Map* empty_object_map() {
-    return context()->native_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; }
 
   // Interface to pending exception.
   MaybeObject* pending_exception() {
     ASSERT(has_pending_exception());
     return thread_local_top_.pending_exception_;
   }
   bool external_caught_exception() {
@@ skipping 901 matching lines @@
 
 // Mark the native context with out of memory.
 inline void Context::mark_out_of_memory() {
   native_context()->set_out_of_memory(HEAP->true_value());
 }
 
 
 } }  // namespace v8::internal
 
 #endif  // V8_ISOLATE_H_