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

src/regexp-stack.cc

 // Copyright 2009 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 39 matching lines @@
 }
 
 
 RegExpStack::~RegExpStack() {
   thread_local_.Free();
 }
 
 
 char* RegExpStack::ArchiveStack(char* to) {
   size_t size = sizeof(thread_local_);
-  memcpy(reinterpret_cast<void*>(to),
-         &thread_local_,
-         size);
+  OS::MemCopy(reinterpret_cast<void*>(to), &thread_local_, size);
   thread_local_ = ThreadLocal();
   return to + size;
 }
 
 
 char* RegExpStack::RestoreStack(char* from) {
   size_t size = sizeof(thread_local_);
-  memcpy(&thread_local_, reinterpret_cast<void*>(from), size);
+  OS::MemCopy(&thread_local_, reinterpret_cast<void*>(from), size);
   return from + size;
 }
 
 
 void RegExpStack::Reset() {
   if (thread_local_.memory_size_ > kMinimumStackSize) {
     DeleteArray(thread_local_.memory_);
     thread_local_ = ThreadLocal();
   }
 }
 
 
 void RegExpStack::ThreadLocal::Free() {
   if (memory_size_ > 0) {
     DeleteArray(memory_);
     Clear();
   }
 }
 
 
 Address RegExpStack::EnsureCapacity(size_t size) {
   if (size > kMaximumStackSize) return NULL;
   if (size < kMinimumStackSize) size = kMinimumStackSize;
   if (thread_local_.memory_size_ < size) {
     Address new_memory = NewArray<byte>(static_cast<int>(size));
     if (thread_local_.memory_size_ > 0) {
       // Copy original memory into top of new memory.
-      memcpy(reinterpret_cast<void*>(
-          new_memory + size - thread_local_.memory_size_),
-             reinterpret_cast<void*>(thread_local_.memory_),
-             thread_local_.memory_size_);
+      OS::MemCopy(
+          reinterpret_cast<void*>(
+              new_memory + size - thread_local_.memory_size_),
+          reinterpret_cast<void*>(thread_local_.memory_),
+          thread_local_.memory_size_);
       DeleteArray(thread_local_.memory_);
     }
     thread_local_.memory_ = new_memory;
     thread_local_.memory_size_ = size;
     thread_local_.limit_ = new_memory + kStackLimitSlack * kPointerSize;
   }
   return thread_local_.memory_ + thread_local_.memory_size_;
 }
 
 
 }}  // namespace v8::internal