Replace OS::MemCopy with OS::MemMove (just as fast but more flexible).

src/builtins.cc

 // 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 313 matching lines @@
       isolate->context()->native_context()->array_function());
 }
 
 
 static void MoveDoubleElements(FixedDoubleArray* dst,
                                int dst_index,
                                FixedDoubleArray* src,
                                int src_index,
                                int len) {
   if (len == 0) return;
-  memmove(dst->data_start() + dst_index,
-          src->data_start() + src_index,
-          len * kDoubleSize);
+  OS::MemMove(dst->data_start() + dst_index,
+              src->data_start() + src_index,
+              len * kDoubleSize);
 }
 
 
 static void FillWithHoles(Heap* heap, FixedArray* dst, int from, int to) {
   ASSERT(dst->map() != heap->fixed_cow_array_map());
   MemsetPointer(dst->data_start() + from, heap->the_hole_value(), to - from);
 }
 
 
 static void FillWithHoles(FixedDoubleArray* dst, int from, int to) {
@@ skipping 1528 matching lines @@
   return Handle<Code>(code_address);                        \
 }
 BUILTIN_LIST_C(DEFINE_BUILTIN_ACCESSOR_C)
 BUILTIN_LIST_A(DEFINE_BUILTIN_ACCESSOR_A)
 BUILTIN_LIST_DEBUG_A(DEFINE_BUILTIN_ACCESSOR_A)
 #undef DEFINE_BUILTIN_ACCESSOR_C
 #undef DEFINE_BUILTIN_ACCESSOR_A
 
 
 } }  // namespace v8::internal