Clean up the usage of V8_TARGET_ARCH_${arch} and V8_HOST_ARCH_${arch}

src/v8utils.h

 // Copyright 2012 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 239 matching lines @@
 
 
 template <typename T, typename U>
 inline void MemsetPointer(T** dest, U* value, int counter) {
 #ifdef DEBUG
   T* a = NULL;
   U* b = NULL;
   a = b;  // Fake assignment to check assignability.
   USE(a);
 #endif  // DEBUG
-#if defined(V8_HOST_ARCH_IA32)
+#if V8_HOST_ARCH_IA32
 #define STOS "stosl"
-#elif defined(V8_HOST_ARCH_X64)
+#elif V8_HOST_ARCH_X64
 #define STOS "stosq"
 #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
 
@@ skipping 112 matching lines @@
 
   // Add formatted contents like printf based on a va_list.
   void AddFormattedList(const char* format, va_list list);
  private:
   DISALLOW_IMPLICIT_CONSTRUCTORS(StringBuilder);
 };
 
 } }  // namespace v8::internal
 
 #endif  // V8_V8UTILS_H_