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

src/platform-linux.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 61 matching lines @@
 #include "vm-state-inl.h"
 
 
 namespace v8 {
 namespace internal {
 
 
 static Mutex* limit_mutex = NULL;
 
 
-uint64_t OS::CpuFeaturesImpliedByPlatform() {
-  return 0;  // Linux runs on anything.
-}
-
-
 #ifdef __arm__
 static bool CPUInfoContainsString(const char * search_string) {
   const char* file_name = "/proc/cpuinfo";
   // This is written as a straight shot one pass parser
   // and not using STL string and ifstream because,
   // on Linux, it's reading from a (non-mmap-able)
   // character special device.
   FILE* f = NULL;
   const char* what = search_string;
 
@@ skipping 682 matching lines @@
   limit_mutex = CreateMutex();
 }
 
 
 void OS::TearDown() {
   delete limit_mutex;
 }
 
 
 } }  // namespace v8::internal