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

src/log-utils.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 149 matching lines @@
 static const int kLowLevelLogBufferSize = 2 * MB;
 
 
 void Log::OpenFile(const char* name) {
   ASSERT(!IsEnabled());
   output_handle_ = OS::FOpen(name, OS::LogFileOpenMode);
   if (FLAG_ll_prof) {
     // Open the low-level log file.
     size_t len = strlen(name);
     ScopedVector<char> ll_name(static_cast<int>(len + sizeof(kLowLevelLogExt)));
-    memcpy(ll_name.start(), name, len);
-    memcpy(ll_name.start() + len, kLowLevelLogExt, sizeof(kLowLevelLogExt));
+    OS::MemCopy(ll_name.start(), name, len);
+    OS::MemCopy(ll_name.start() + len,
+                kLowLevelLogExt, sizeof(kLowLevelLogExt));
     ll_output_handle_ = OS::FOpen(ll_name.start(), OS::LogFileOpenMode);
     setvbuf(ll_output_handle_, NULL, _IOFBF, kLowLevelLogBufferSize);
   }
 }
 
 
 FILE* Log::Close() {
   FILE* result = NULL;
   if (output_handle_ != NULL) {
     if (strcmp(FLAG_logfile, kLogToTemporaryFile) != 0) {
@@ skipping 124 matching lines @@
   ASSERT(pos_ <= Log::kMessageBufferSize);
   const int written = log_->WriteToFile(log_->message_buffer_, pos_);
   if (written != pos_) {
     log_->stop();
     log_->logger_->LogFailure();
   }
 }
 
 
 } }  // namespace v8::internal