Also allow the empty object map to keep transitions.

src/isolate.h

Index: src/isolate.h
diff --git a/src/isolate.h b/src/isolate.h
index 8ac85028791f53a58567a69c1a04f32999941181..e1d43d9ee0661d461d57c0ce6765aefd0017797f 100644
--- a/src/isolate.h
+++ b/src/isolate.h
@@ -531,11 +531,6 @@ class Isolate {
     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; }