Make __proto__ a foreign callback on Object.prototype.

src/factory.cc

 // Copyright 2012 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 921 matching lines @@
 
 Handle<GlobalObject> Factory::NewGlobalObject(
     Handle<JSFunction> constructor) {
   CALL_HEAP_FUNCTION(isolate(),
                      isolate()->heap()->AllocateGlobalObject(*constructor),
                      GlobalObject);
 }
 
 
 
-Handle<JSObject> Factory::NewJSObjectFromMap(Handle<Map> map) {
+Handle<JSObject> Factory::NewJSObjectFromMap(Handle<Map> map,
+                                             PretenureFlag pretenure) {
   CALL_HEAP_FUNCTION(
       isolate(),
-      isolate()->heap()->AllocateJSObjectFromMap(*map, NOT_TENURED),
+      isolate()->heap()->AllocateJSObjectFromMap(*map, pretenure),
       JSObject);
 }
 
 
 Handle<JSArray> Factory::NewJSArray(int capacity,
                                     ElementsKind elements_kind,
                                     PretenureFlag pretenure) {
   if (capacity != 0) {
     elements_kind = GetHoleyElementsKind(elements_kind);
   }
@@ skipping 491 matching lines @@
 
 
 Handle<Object> Factory::ToBoolean(bool value) {
   return Handle<Object>(value
                         ? isolate()->heap()->true_value()
                         : isolate()->heap()->false_value());
 }
 
 
 } }  // namespace v8::internal