Avoid manual object's body traversal in GC.

src/heap/store-buffer.h

 // Copyright 2011 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_STORE_BUFFER_H_
 #define V8_STORE_BUFFER_H_
 
 #include "src/allocation.h"
 #include "src/base/logging.h"
 #include "src/base/platform/platform.h"
@@ skipping 144 matching lines @@
   void IteratePointersOnPage(PagedSpace* space, Page* page,
                              RegionCallback region_callback,
                              ObjectSlotCallback slot_callback);
 
   void IteratePointersInStoreBuffer(ObjectSlotCallback slot_callback);
 
 #ifdef VERIFY_HEAP
   void VerifyPointers(LargeObjectSpace* space);
 #endif
 
+  friend class DontMoveStoreBufferEntriesScope;
+  friend class FindPointersToNewSpaceVisitor;
   friend class StoreBufferRebuildScope;
-  friend class DontMoveStoreBufferEntriesScope;
 };
 
 
 class StoreBufferRebuilder {
  public:
   explicit StoreBufferRebuilder(StoreBuffer* store_buffer)
       : store_buffer_(store_buffer) {}
 
   void Callback(MemoryChunk* page, StoreBufferEvent event);
 
@@ skipping 47 matching lines @@
   }
 
  private:
   StoreBuffer* store_buffer_;
   bool stored_state_;
 };
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_STORE_BUFFER_H_