Don't record elements transition slots since it will contain a map.

src/mark-compact.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 378 matching lines @@
  public:
   Marker(BaseMarker* base_marker, MarkCompactCollector* mark_compact_collector)
       : base_marker_(base_marker),
         mark_compact_collector_(mark_compact_collector) {}
 
   // Mark pointers in a Map and its DescriptorArray together, possibly
   // treating transitions or back pointers weak.
   void MarkMapContents(Map* map);
   void MarkDescriptorArray(DescriptorArray* descriptors);
   void MarkTransitionArray(TransitionArray* transitions);
-  void MarkAccessorPairSlot(AccessorPair* accessors, int offset);
 
  private:
   BaseMarker* base_marker() {
     return base_marker_;
   }
 
   MarkCompactCollector* mark_compact_collector() {
     return mark_compact_collector_;
   }
 
@@ skipping 377 matching lines @@
 
   friend class Heap;
 };
 
 
 const char* AllocationSpaceName(AllocationSpace space);
 
 } }  // namespace v8::internal
 
 #endif  // V8_MARK_COMPACT_H_