Refactor word copying logic.

src/builtins.cc

 // Copyright 2006-2008 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 250 matching lines @@
 }
 
 
 static void CopyElements(AssertNoAllocation* no_gc,
                          FixedArray* dst,
                          int dst_index,
                          FixedArray* src,
                          int src_index,
                          int len) {
   ASSERT(dst != src);  // Use MoveElements instead.
-  memcpy(dst->data_start() + dst_index,
-         src->data_start() + src_index,
-         len * kPointerSize);
+  CopyWords(dst->data_start() + dst_index,
+            src->data_start() + src_index,
+            len);
   WriteBarrierMode mode = dst->GetWriteBarrierMode(*no_gc);
   if (mode == UPDATE_WRITE_BARRIER) {
     Heap::RecordWrites(dst->address(), dst->OffsetOfElementAt(dst_index), len);
   }
 }
 
 
 static void MoveElements(AssertNoAllocation* no_gc,
                          FixedArray* dst,
                          int dst_index,
@@ skipping 1186 matching lines @@
       if (entry->contains(pc)) {
         return names_[i];
       }
     }
   }
   return NULL;
 }
 
 
 } }  // namespace v8::internal