Drop unused rdtsc instruction.

src/x64/assembler-x64.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 1901 matching lines @@
   emitl(imm32);
 }
 
 
 void Assembler::pushfq() {
   EnsureSpace ensure_space(this);
   emit(0x9C);
 }
 
 
-void Assembler::rdtsc() {
-  EnsureSpace ensure_space(this);
-  emit(0x0F);
-  emit(0x31);
-}
-
-
 void Assembler::ret(int imm16) {
   EnsureSpace ensure_space(this);
   ASSERT(is_uint16(imm16));
   if (imm16 == 0) {
     emit(0xC3);
   } else {
     emit(0xC2);
     emit(imm16 & 0xFF);
     emit((imm16 >> 8) & 0xFF);
   }
@@ skipping 1171 matching lines @@
 bool RelocInfo::IsCodedSpecially() {
   // The deserializer needs to know whether a pointer is specially coded.  Being
   // specially coded on x64 means that it is a relative 32 bit address, as used
   // by branch instructions.
   return (1 << rmode_) & kApplyMask;
 }
 
 } }  // namespace v8::internal
 
 #endif  // V8_TARGET_ARCH_X64