A change in the way we place TransitionElementKinds in the tree.

src/objects.cc

Index: src/objects.cc
diff --git a/src/objects.cc b/src/objects.cc
index 85b43bad7f10e6e67e3ee4a7ec5dc74f2776db94..14f0b98d7a3abbf6d0c5bec5abbff78cb0c304fb 100644
--- a/src/objects.cc
+++ b/src/objects.cc
@@ -2322,7 +2322,7 @@ Handle<Map> Map::FindTransitionedMap(MapHandleList* candidates) {
 }
 
 
-static Map* FindClosestElementsTransition(Map* map, ElementsKind to_kind) {
+Map* FindClosestElementsTransition(Map* map, ElementsKind to_kind) {
   Map* current_map = map;
   int index = GetSequenceIndexFromFastElementsKind(map->elements_kind());
   int to_index = IsFastElementsKind(to_kind)
@@ -2353,17 +2353,16 @@ Map* Map::LookupElementsTransitionMap(ElementsKind to_kind) {
 }
 
 
-static MaybeObject* AddMissingElementsTransitions(Map* map,
-                                                  ElementsKind to_kind) {
-  ASSERT(IsFastElementsKind(map->elements_kind()));
-  int index = GetSequenceIndexFromFastElementsKind(map->elements_kind());
+MaybeObject* Map::AddMissingElementsTransitions(ElementsKind to_kind) {
+  ASSERT(IsFastElementsKind(elements_kind()));
+  int index = GetSequenceIndexFromFastElementsKind(elements_kind());
   int to_index = IsFastElementsKind(to_kind)
       ? GetSequenceIndexFromFastElementsKind(to_kind)
       : GetSequenceIndexFromFastElementsKind(TERMINAL_FAST_ELEMENTS_KIND);
 
   ASSERT(index <= to_index);
 
-  Map* current_map = map;
+  Map* current_map = this;
 
   for (; index < to_index; ++index) {
     ElementsKind next_kind = GetFastElementsKindFromSequenceIndex(index + 1);
@@ -2427,7 +2426,7 @@ MaybeObject* JSObject::GetElementsTransitionMapSlow(ElementsKind to_kind) {
     return closest_map;
   }
 
-  return AddMissingElementsTransitions(closest_map, to_kind);
+  return closest_map->AddMissingElementsTransitions(to_kind);
 }