Don't duplicate OS::CpuFeaturesImpliedByPlatform for every POSIX platform.

src/platform-macos.cc

 // 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 213 matching lines @@
     LOG(Isolate::Current(),
         SharedLibraryEvent(_dyld_get_image_name(i), start, start + size));
   }
 }
 
 
 void OS::SignalCodeMovingGC() {
 }
 
 
-uint64_t OS::CpuFeaturesImpliedByPlatform() {
-  // MacOSX requires all these to install so we can assume they are present.
-  // These constants are defined by the CPUid instructions.
-  const uint64_t one = 1;
-  return (one << SSE2) | (one << CMOV) | (one << RDTSC) | (one << CPUID);
-}
-
-
 int OS::ActivationFrameAlignment() {
   // OS X activation frames must be 16 byte-aligned; see "Mac OS X ABI
   // Function Call Guide".
   return 16;
 }
 
 
 const char* OS::LocalTimezone(double time) {
   if (std::isnan(time)) return "";
   time_t tv = static_cast<time_t>(floor(time/msPerSecond));
@@ skipping 209 matching lines @@
   limit_mutex = CreateMutex();
 }
 
 
 void OS::TearDown() {
   delete limit_mutex;
 }
 
 
 } }  // namespace v8::internal