Remove the HValueOf instruction.

src/x64/lithium-codegen-x64.cc

 // Copyright 2013 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 1570 matching lines @@
   // Load map into |result|.
   __ movp(result, FieldOperand(input, HeapObject::kMapOffset));
   // Load the map's "bit field 2" into |result|. We only need the first byte.
   __ movzxbq(result, FieldOperand(result, Map::kBitField2Offset));
   // Retrieve elements_kind from bit field 2.
   __ and_(result, Immediate(Map::kElementsKindMask));
   __ shr(result, Immediate(Map::kElementsKindShift));
 }
 
 
-void LCodeGen::DoValueOf(LValueOf* instr) {
-  Register input = ToRegister(instr->value());
-  Register result = ToRegister(instr->result());
-  ASSERT(input.is(result));
-  Label done;
-
-  if (!instr->hydrogen()->value()->IsHeapObject()) {
-    // If the object is a smi return the object.
-    __ JumpIfSmi(input, &done, Label::kNear);
-  }
-
-  // If the object is not a value type, return the object.
-  __ CmpObjectType(input, JS_VALUE_TYPE, kScratchRegister);
-  __ j(not_equal, &done, Label::kNear);
-  __ movp(result, FieldOperand(input, JSValue::kValueOffset));
-
-  __ bind(&done);
-}
-
-
 void LCodeGen::DoDateField(LDateField* instr) {
   Register object = ToRegister(instr->date());
   Register result = ToRegister(instr->result());
   Smi* index = instr->index();
   Label runtime, done, not_date_object;
   ASSERT(object.is(result));
   ASSERT(object.is(rax));
 
   Condition cc = masm()->CheckSmi(object);
   DeoptimizeIf(cc, instr->environment());
@@ skipping 3972 matching lines @@
                                FixedArray::kHeaderSize - kPointerSize));
   __ bind(&done);
 }
 
 
 #undef __
 
 } }  // namespace v8::internal
 
 #endif  // V8_TARGET_ARCH_X64