Move CopyElements to the accessor of the target.

src/elements.h

 // Copyright 2012 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 125 matching lines @@
   // destination array with the hole.
   static const int kCopyToEndAndInitializeToHole = -2;
 
   // Copy elements from one backing store to another. Typically, callers specify
   // the source JSObject or JSArray in source_holder. If the holder's backing
   // store is available, it can be passed in source and source_holder is
   // ignored.
   MUST_USE_RESULT virtual MaybeObject* CopyElements(
       JSObject* source_holder,
       uint32_t source_start,
+      ElementsKind source_kind,
       FixedArrayBase* destination,
-      ElementsKind destination_kind,
       uint32_t destination_start,
       int copy_size,
       FixedArrayBase* source = NULL) = 0;
 
   MUST_USE_RESULT MaybeObject* CopyElements(JSObject* from_holder,
                                             FixedArrayBase* to,
-                                            ElementsKind to_kind,
+                                            ElementsKind from_kind,
                                             FixedArrayBase* from = NULL) {
-    return CopyElements(from_holder, 0, to, to_kind, 0,
+    return CopyElements(from_holder, 0, from_kind, to, 0,
                         kCopyToEndAndInitializeToHole, from);
   }
 
   MUST_USE_RESULT virtual MaybeObject* AddElementsToFixedArray(
       Object* receiver,
       JSObject* holder,
       FixedArray* to,
       FixedArrayBase* from = NULL) = 0;
 
   // Returns a shared ElementsAccessor for the specified ElementsKind.
@@ skipping 26 matching lines @@
  private:
   static ElementsAccessor** elements_accessors_;
   const char* name_;
 
   DISALLOW_COPY_AND_ASSIGN(ElementsAccessor);
 };
 
 } }  // namespace v8::internal
 
 #endif  // V8_ELEMENTS_H_