When following an accessor transition for an already existing accessor, don't load the last added d…

src/property.h

 // 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 310 matching lines @@
   Map* GetTransitionMapFromMap(Map* map) {
     ASSERT(IsTransition());
     return map->transitions()->GetTarget(number_);
   }
 
   int GetTransitionIndex() {
     ASSERT(IsTransition());
     return number_;
   }
 
+  int GetDescriptorIndex() {
+    ASSERT(lookup_type_ == DESCRIPTOR_TYPE);
+    return number_;
+  }
+
   int GetFieldIndex() {
     ASSERT(lookup_type_ == DESCRIPTOR_TYPE);
     ASSERT(IsField());
     return Descriptor::IndexFromValue(GetValue());
   }
 
   int GetLocalFieldIndexFromMap(Map* map) {
     ASSERT(IsField());
     return Descriptor::IndexFromValue(GetValueFromMap(map)) -
         map->inobject_properties();
@@ skipping 60 matching lines @@
   JSReceiver* holder_;
   int number_;
   bool cacheable_;
   PropertyDetails details_;
 };
 
 
 } }  // namespace v8::internal
 
 #endif  // V8_PROPERTY_H_