Add Smi::Zero and replace all Smi::FromInt(0) calls

src/x64/code-stubs-x64.cc

 // Copyright 2013 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #if V8_TARGET_ARCH_X64
 
 #include "src/code-stubs.h"
 #include "src/api-arguments.h"
 #include "src/bootstrapper.h"
 #include "src/codegen.h"
@@ skipping 4835 matching lines @@
 
   // Insert additional parameters into the stack frame above return address.
   __ PopReturnAddressTo(scratch);
   __ Push(receiver);
   __ Push(FieldOperand(callback, AccessorInfo::kDataOffset));
   __ LoadRoot(kScratchRegister, Heap::kUndefinedValueRootIndex);
   __ Push(kScratchRegister);  // return value
   __ Push(kScratchRegister);  // return value default
   __ PushAddress(ExternalReference::isolate_address(isolate()));
   __ Push(holder);
-  __ Push(Smi::FromInt(0));  // should_throw_on_error -> false
+  __ Push(Smi::kZero);  // should_throw_on_error -> false
   __ Push(FieldOperand(callback, AccessorInfo::kNameOffset));
   __ PushReturnAddressFrom(scratch);
 
   // v8::PropertyCallbackInfo::args_ array and name handle.
   const int kStackUnwindSpace = PropertyCallbackArguments::kArgsLength + 1;
 
   // Allocate v8::PropertyCallbackInfo in non-GCed stack space.
   const int kArgStackSpace = 1;
 
   // Load address of v8::PropertyAccessorInfo::args_ array.
@@ skipping 28 matching lines @@
                            kStackUnwindSpace, nullptr, return_value_operand,
                            NULL);
 }
 
 #undef __
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_TARGET_ARCH_X64