Map::TransitionElementsTo() extracted from JSObject::GetElementsTransitionMap().

src/objects.h

Index: src/objects.h
diff --git a/src/objects.h b/src/objects.h
index c9d27ab120e3719152dea48e9cbaa960113d2dd8..99f7f49054c0de55377965f4cf4de853272bda6a 100644
--- a/src/objects.h
+++ b/src/objects.h
@@ -2459,9 +2459,6 @@ class JSObject: public JSReceiver {
   // map and the ElementsKind set.
   static Handle<Map> GetElementsTransitionMap(Handle<JSObject> object,
                                               ElementsKind to_kind);
-  static Handle<Map> GetElementsTransitionMapSlow(Handle<JSObject> object,
-                                                  ElementsKind elements_kind);
-
   static void TransitionElementsKind(Handle<JSObject> object,
                                      ElementsKind to_kind);
 
@@ -6314,6 +6311,11 @@ class Map: public HeapObject {
       PropertyAttributes attributes,
       TransitionFlag flag);
 
+  // Returns a new map with all transitions dropped from the given map and
+  // the ElementsKind set.
+  static Handle<Map> TransitionElementsTo(Handle<Map> map,
+                                          ElementsKind to_kind);
+
   static Handle<Map> AsElementsKind(Handle<Map> map, ElementsKind kind);
 
   static Handle<Map> CopyAsElementsKind(Handle<Map> map,
@@ -6575,6 +6577,9 @@ class Map: public HeapObject {
   // the descriptor array.
   inline void NotifyLeafMapLayoutChange();
 
+  static Handle<Map> TransitionElementsToSlow(Handle<Map> object,
+                                              ElementsKind to_kind);
+
   // Zaps the contents of backing data structures. Note that the
   // heap verifier (i.e. VerifyMarkingVisitor) relies on zapping of objects
   // holding weak references when incremental marking is used, because it also