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

src/unicode-inl.h

 // Copyright 2007-2010 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 12 matching lines @@
 // DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 // THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 
 #ifndef V8_UNICODE_INL_H_
 #define V8_UNICODE_INL_H_
 
 #include "unicode.h"
 #include "checks.h"
+#include "platform.h"
 
 namespace unibrow {
 
 template <class T, int s> bool Predicate<T, s>::get(uchar code_point) {
   CacheEntry entry = entries_[code_point & kMask];
   if (entry.code_point_ == code_point) return entry.value_;
   return CalculateValue(code_point);
 }
 
 template <class T, int s> bool Predicate<T, s>::CalculateValue(
@@ skipping 152 matching lines @@
 
 template <unsigned kBufferSize>
 unsigned Utf8Decoder<kBufferSize>::WriteUtf16(uint16_t* data,
                                               unsigned length) const {
   ASSERT(length > 0);
   if (length > utf16_length_) length = utf16_length_;
   // memcpy everything in buffer.
   unsigned buffer_length =
       last_byte_of_buffer_unused_ ? kBufferSize - 1 : kBufferSize;
   unsigned memcpy_length = length <= buffer_length  ? length : buffer_length;
-  memcpy(data, buffer_, memcpy_length*sizeof(uint16_t));
+  v8::internal::OS::MemCopy(data, buffer_, memcpy_length*sizeof(uint16_t));
   if (length <= buffer_length) return length;
   ASSERT(unbuffered_start_ != NULL);
   // Copy the rest the slow way.
   WriteUtf16Slow(unbuffered_start_,
                  data + buffer_length,
                  length - buffer_length);
   return length;
 }
 
 }  // namespace unibrow
 
 #endif  // V8_UNICODE_INL_H_