Changing byte_size from size_t to int in heap-inl.h (making win64 build work)

src/heap.h

Index: src/heap.h
===================================================================
--- src/heap.h	(revision 4405)
+++ src/heap.h	(working copy)
@@ -955,7 +955,7 @@
 
   // Optimized version of memmove for blocks with pointer size aligned sizes and
   // pointer size aligned addresses.
-  static inline void MoveBlock(Object** dst, Object** src, size_t byte_size);
+  static inline void MoveBlock(Object** dst, Object** src, int byte_size);
 
   // Check new space expansion criteria and expand semispaces if it was hit.
   static void CheckNewSpaceExpansionCriteria();