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

src/isolate.h

Index: src/isolate.h
diff --git a/src/isolate.h b/src/isolate.h
index 50ecc53cd49ee91c98670744a6c600461d95bb8d..ca156345e74bc5a1e69f33b3d6f778ba76394b24 100644
--- a/src/isolate.h
+++ b/src/isolate.h
@@ -528,6 +528,11 @@ class Isolate {
     thread_local_top_.save_context_ = save;
   }
 
+  // Access to the map of "new Object()"

[Jakob Kummerow, 2012/07/12 14:38:19]

nit: Comments should be sentences with one or more verbs and appropriate
punctuation (such as a trailing full stop).

+  Map* global_object_map() {

[Jakob Kummerow, 2012/07/12 14:38:19]

The name is misleading. "empty_object_map" would be better, to emphasize that
this is not the map of the global object.

+    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; }