Enable --verify-heap in release mode

src/store-buffer.h

 // Copyright 2011 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 177 matching lines @@
     ObjectSlotCallback slot_callback);
 
   void FindPointersToNewSpaceOnPage(
     PagedSpace* space,
     Page* page,
     RegionCallback region_callback,
     ObjectSlotCallback slot_callback);
 
   void IteratePointersInStoreBuffer(ObjectSlotCallback slot_callback);
 
-#ifdef DEBUG
+#ifdef VERIFY_HEAP
   void VerifyPointers(PagedSpace* space, RegionCallback region_callback);
   void VerifyPointers(LargeObjectSpace* space);
 #endif
 
   friend class StoreBufferRebuildScope;
   friend class DontMoveStoreBufferEntriesScope;
 };
 
 
 class StoreBufferRebuildScope {
@@ skipping 37 matching lines @@
   }
 
  private:
   StoreBuffer* store_buffer_;
   bool stored_state_;
 };
 
 } }  // namespace v8::internal
 
 #endif  // V8_STORE_BUFFER_H_