Bugfix: A TransitionArray can disappear during copy.

src/objects.cc

Index: src/objects.cc
diff --git a/src/objects.cc b/src/objects.cc
index 859cb8a520acc9c7d55c21439ebe5ca9d677cf47..e283cc787b00729b76c6c9e9eaffdcae1b9621bb 100644
--- a/src/objects.cc
+++ b/src/objects.cc
@@ -2501,11 +2501,7 @@ Handle<TransitionArray> Map::AddTransition(Handle<Map> map,
                                            Handle<Name> key,
                                            Handle<Map> target,
                                            SimpleTransitionFlag flag) {
-  if (map->HasTransitionArray()) {
-    return TransitionArray::CopyInsert(map, key, target);
-  }
-  return TransitionArray::NewWith(
-      flag, key, target, handle(map->GetBackPointer(), map->GetIsolate()));
+  return TransitionArray::AddTransition(map, key, target, flag);

[Toon Verwaest, 2014/04/10 11:49:28]

I presume there's no point anymore to having this wrapper on Map?

[mvstanton, 2014/04/10 13:10:45]

Yep, bye-bye silly wabbit.

 }