Drop unused rdtsc instruction.

src/platform-posix.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 65 matching lines @@
 
 // 0 is never a valid thread id.
 static const pthread_t kNoThread = (pthread_t) 0;
 
 
 uint64_t OS::CpuFeaturesImpliedByPlatform() {
 #if defined(__APPLE__)
   // Mac OS X 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);
+  return (one << SSE2) | (one << CMOV) | (one << CPUID);
 #else
   return 0;  // Nothing special about the other systems.
 #endif
 }
 
 
 // Maximum size of the virtual memory.  0 means there is no artificial
 // limit.
 
 intptr_t OS::MaxVirtualMemory() {
@@ skipping 893 matching lines @@
   return ntohl(value);
 }
 
 
 Socket* OS::CreateSocket() {
   return new POSIXSocket();
 }
 
 
 } }  // namespace v8::internal