Support Smi->Double->HeapObject transitions in constructed Arrays.

src/factory.h

 // Copyright 2011 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 241 matching lines @@
 
   // JS objects are pretenured when allocated by the bootstrapper and
   // runtime.
   Handle<JSObject> NewJSObjectFromMap(Handle<Map> map);
 
   // JS arrays are pretenured when allocated by the parser.
   Handle<JSArray> NewJSArray(int capacity,
                              PretenureFlag pretenure = NOT_TENURED);
 
   Handle<JSArray> NewJSArrayWithElements(
-      Handle<FixedArray> elements,
+      Handle<FixedArrayBase> elements,
       PretenureFlag pretenure = NOT_TENURED);
 
-  void SetContent(Handle<JSArray> array, Handle<FixedArray> elements);
+  void SetContent(Handle<JSArray> array, Handle<FixedArrayBase> elements);
 
-  void EnsureCanContainNonSmiElements(Handle<JSArray> array);
+  void EnsureCanContainHeapObjectElements(Handle<JSArray> array);
+  void EnsureCanContainElements(Handle<JSArray> array,
+                                Handle<FixedArrayBase> elements,
+                                EnsureElementsMode mode);
 
   Handle<JSProxy> NewJSProxy(Handle<Object> handler, Handle<Object> prototype);
 
   // Change the type of the argument into a JS object/function and reinitialize.
   void BecomeJSObject(Handle<JSReceiver> object);
   void BecomeJSFunction(Handle<JSReceiver> object);
 
   void SetIdentityHash(Handle<JSObject> object, Object* hash);
 
   Handle<JSFunction> NewFunction(Handle<String> name,
@@ skipping 203 matching lines @@
   // Update the map cache in the global context with (keys, map)
   Handle<MapCache> AddToMapCache(Handle<Context> context,
                                  Handle<FixedArray> keys,
                                  Handle<Map> map);
 };
 
 
 } }  // namespace v8::internal
 
 #endif  // V8_FACTORY_H_