Remove NaCl support.

src/utils.h

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef V8_UTILS_H_
 #define V8_UTILS_H_
 
 #include <limits.h>
 #include <stdlib.h>
 #include <string.h>
@@ skipping 1081 matching lines @@
 #endif  // DEBUG
 #if V8_HOST_ARCH_IA32
 #define STOS "stosl"
 #elif V8_HOST_ARCH_X64
 #if V8_HOST_ARCH_32_BIT
 #define STOS "addr32 stosl"
 #else
 #define STOS "stosq"
 #endif
 #endif
-#if defined(__native_client__)
-  // This STOS sequence does not validate for x86_64 Native Client.
-  // Here we #undef STOS to force use of the slower C version.
-  // TODO(bradchen): Profile V8 and implement a faster REP STOS
-  // here if the profile indicates it matters.
-#undef STOS
-#endif
 
 #if defined(MEMORY_SANITIZER)
   // MemorySanitizer does not understand inline assembly.
 #undef STOS
 #endif
 
 #if defined(__GNUC__) && defined(STOS)
   asm volatile(
       "cld;"
       "rep ; " STOS
@@ skipping 457 matching lines @@
   byte* dst = reinterpret_cast<byte*>(p);
   for (size_t i = 0; i < sizeof(V); i++) {
     dst[i] = src[sizeof(V) - i - 1];
   }
 #endif  // V8_TARGET_LITTLE_ENDIAN
 }
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_UTILS_H_