Make object groups and implicit references a bit more lightweight.

src/v8utils.h

Index: src/v8utils.h
diff --git a/src/v8utils.h b/src/v8utils.h
index 87c5e7f42938f6896ede17114d2fc2d85234e976..93fc1fda52f204568c5831efe825b4a608e5389e 100644
--- a/src/v8utils.h
+++ b/src/v8utils.h
@@ -120,7 +120,9 @@ inline Vector< Handle<Object> > HandleVector(v8::internal::Handle<T>* elms,
 // Memory
 
 // Copies data from |src| to |dst|.  The data spans MUST not overlap.
-inline void CopyWords(Object** dst, Object** src, int num_words) {
+template <typename T>
+inline void CopyWords(T* dst, T* src, int num_words) {
+  STATIC_ASSERT(sizeof(T) == kPointerSize);
   ASSERT(Min(dst, src) + num_words <= Max(dst, src));
   ASSERT(num_words > 0);