Get rid of the HInstanceSize instruction.

src/x64/lithium-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 1056 matching lines @@
 
 LInstruction* LChunkBuilder::DoInstanceOfKnownGlobal(
     HInstanceOfKnownGlobal* instr) {
   LInstanceOfKnownGlobal* result =
       new(zone()) LInstanceOfKnownGlobal(UseFixed(instr->left(), rax),
                                          FixedTemp(rdi));
   return MarkAsCall(DefineFixed(result, rax), instr);
 }
 
 
-LInstruction* LChunkBuilder::DoInstanceSize(HInstanceSize* instr) {
-  LOperand* object = UseRegisterAtStart(instr->object());
-  return DefineAsRegister(new(zone()) LInstanceSize(object));
-}
-
-
 LInstruction* LChunkBuilder::DoWrapReceiver(HWrapReceiver* instr) {
   LOperand* receiver = UseRegister(instr->receiver());
   LOperand* function = UseRegisterAtStart(instr->function());
   LWrapReceiver* result = new(zone()) LWrapReceiver(receiver, function);
   return AssignEnvironment(DefineSameAsFirst(result));
 }
 
 
 LInstruction* LChunkBuilder::DoApplyArguments(HApplyArguments* instr) {
   LOperand* function = UseFixed(instr->function(), rdi);
@@ skipping 1460 matching lines @@
 LInstruction* LChunkBuilder::DoLoadFieldByIndex(HLoadFieldByIndex* instr) {
   LOperand* object = UseRegister(instr->object());
   LOperand* index = UseTempRegister(instr->index());
   return DefineSameAsFirst(new(zone()) LLoadFieldByIndex(object, index));
 }
 
 
 } }  // namespace v8::internal
 
 #endif  // V8_TARGET_ARCH_X64