Add infrastructure to keep track of references to prototypes.

src/lookup.h

 // Copyright 2014 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.
 
 #ifndef V8_LOOKUP_H_
 #define V8_LOOKUP_H_
 
 #include "src/factory.h"
 #include "src/isolate.h"
 #include "src/objects.h"
@@ skipping 159 matching lines @@
   }
   int dictionary_entry() const {
     DCHECK(has_property_);
     DCHECK(holder_map_->is_dictionary_map());
     return number_;
   }
 
   static Configuration ComputeConfiguration(
       Configuration configuration, Handle<Name> name) {
     if (name->IsOwn()) {
-      return static_cast<Configuration>(configuration & HIDDEN);
+      return static_cast<Configuration>(configuration &
+                                        HIDDEN_SKIP_INTERCEPTOR);
     } else {
       return configuration;
     }
   }
 
   // If configuration_ becomes mutable, update
   // HolderIsReceiverOrHiddenPrototype.
   Configuration configuration_;
   State state_;
   bool has_property_;
   PropertyDetails property_details_;
   Isolate* isolate_;
   Handle<Name> name_;
   Handle<Map> holder_map_;
   Handle<Map> transition_map_;
   Handle<Object> receiver_;
   Handle<JSReceiver> holder_;
 
   int number_;
 };
 
 
 } }  // namespace v8::internal
 
 #endif  // V8_LOOKUP_H_