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

src/preparser-api.cc

 // Copyright 2011 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 82 matching lines @@
           pushback_buffer_backing_size_ = kPushBackSize;
         }
         pushback_buffer_ = pushback_buffer_backing_;
         pushback_buffer_end_cache_ = buffer_end_;
         buffer_end_ = pushback_buffer_backing_ + pushback_buffer_backing_size_;
         buffer_cursor_ = buffer_end_ - 1;
       } else {
         // Hit the bottom of the allocated pushback buffer.
         // Double the buffer and continue.
         uc16* new_buffer = NewArray<uc16>(pushback_buffer_backing_size_ * 2);
-        memcpy(new_buffer + pushback_buffer_backing_size_,
-               pushback_buffer_backing_,
-               pushback_buffer_backing_size_);
+        OS::MemCopy(new_buffer + pushback_buffer_backing_size_,
+                    pushback_buffer_backing_,
+                    pushback_buffer_backing_size_);
         DeleteArray(pushback_buffer_backing_);
         buffer_cursor_ = new_buffer + pushback_buffer_backing_size_;
         pushback_buffer_backing_ = pushback_buffer_ = new_buffer;
         buffer_end_ = pushback_buffer_backing_ + pushback_buffer_backing_size_;
       }
     }
     pushback_buffer_[buffer_cursor_ - pushback_buffer_- 1] =
         static_cast<uc16>(ch);
     pos_--;
   }
@@ skipping 71 matching lines @@
   if (result == preparser::PreParser::kPreParseStackOverflow) {
     return PreParserData::StackOverflow();
   }
   internal::Vector<unsigned> pre_data = recorder.ExtractData();
   size_t size = pre_data.length() * sizeof(pre_data[0]);
   unsigned char* data = reinterpret_cast<unsigned char*>(pre_data.start());
   return PreParserData(size, data);
 }
 
 }  // namespace v8.