[heap] Optimize migration of objects round two

src/heap/heap.h

Index: src/heap/heap.h
diff --git a/src/heap/heap.h b/src/heap/heap.h
index 8af1e3844aba9ec14264d7c11e93b100a1602ace..ddd1c32ca899c32d16da346552df02be096b974e 100644
--- a/src/heap/heap.h
+++ b/src/heap/heap.h
@@ -594,10 +594,6 @@ class Heap {
   // by pointer size.
   static inline void CopyBlock(Address dst, Address src, int byte_size);
 
-  // Optimized version of memmove for blocks with pointer size aligned sizes and
-  // pointer size aligned addresses.
-  static inline void MoveBlock(Address dst, Address src, int byte_size);
-
   // Determines a static visitor id based on the given {map} that can then be
   // stored on the map to facilitate fast dispatch for {StaticVisitorBase}.
   static int GetStaticVisitorIdForMap(Map* map);