Introduce x87 port

src/x87/cpu-x87.cc

 // Copyright 2011 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.
 
 // CPU specific code for ia32 independent of OS goes here.
 
 #ifdef __GNUC__
 #include "third_party/valgrind/valgrind.h"
 #endif
 
 #include "v8.h"
 
-#if V8_TARGET_ARCH_IA32
+#if V8_TARGET_ARCH_X87
 
 #include "cpu.h"
 #include "macro-assembler.h"
 
 namespace v8 {
 namespace internal {
 
 void CPU::FlushICache(void* start, size_t size) {
   // No need to flush the instruction cache on Intel. On Intel instruction
   // cache flushing is only necessary when multiple cores running the same
@@ skipping 10 matching lines @@
   // solution is to run valgrind with --smc-check=all, but this comes at a big
   // performance cost.  We can notify valgrind to invalidate its cache.
 #ifdef VALGRIND_DISCARD_TRANSLATIONS
   unsigned res = VALGRIND_DISCARD_TRANSLATIONS(start, size);
   USE(res);
 #endif
 }
 
 } }  // namespace v8::internal
 
-#endif  // V8_TARGET_ARCH_IA32
+#endif  // V8_TARGET_ARCH_X87