Use LookupIterator to transition to accessors

src/runtime.cc

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include <stdlib.h>
 #include <limits>
 
 #include "src/v8.h"
 
 #include "src/accessors.h"
@@ skipping 4930 matching lines @@
 
 
 static bool IsValidAccessor(Handle<Object> obj) {
   return obj->IsUndefined() || obj->IsSpecFunction() || obj->IsNull();
 }
 
 
 // Transform getter or setter into something DefineAccessor can handle.
 static Handle<Object> InstantiateAccessorComponent(Isolate* isolate,
                                                    Handle<Object> component) {
-  if (component->IsUndefined()) return isolate->factory()->null_value();
+  if (component->IsUndefined()) return isolate->factory()->undefined_value();
   Handle<FunctionTemplateInfo> info =
       Handle<FunctionTemplateInfo>::cast(component);
   return Utils::OpenHandle(*Utils::ToLocal(info)->GetFunction());
 }
 
 
 RUNTIME_FUNCTION(Runtime_DefineApiAccessorProperty) {
   HandleScope scope(isolate);
   DCHECK(args.length() == 5);
   CONVERT_ARG_HANDLE_CHECKED(JSObject, object, 0);
@@ skipping 10664 matching lines @@
   }
   return NULL;
 }
 
 
 const Runtime::Function* Runtime::FunctionForId(Runtime::FunctionId id) {
   return &(kIntrinsicFunctions[static_cast<int>(id)]);
 }
 
 } }  // namespace v8::internal