Drop unused rdtsc instruction.

src/ia32/assembler-ia32.cc

 // Copyright (c) 1994-2006 Sun Microsystems Inc.
 // 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.
 //
@@ skipping 1292 matching lines @@
   EMIT(0xCC);
 }
 
 
 void Assembler::nop() {
   EnsureSpace ensure_space(this);
   EMIT(0x90);
 }
 
 
-void Assembler::rdtsc() {
-  ASSERT(IsEnabled(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 1384 matching lines @@
     fprintf(coverage_log, "%s\n", file_line);
     fflush(coverage_log);
   }
 }
 
 #endif
 
 } }  // namespace v8::internal
 
 #endif  // V8_TARGET_ARCH_IA32