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

src/builtins/builtins-dataview.cc

 // Copyright 2016 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.
 
 #include "src/builtins/builtins.h"
 #include "src/builtins/builtins-utils.h"
 
 namespace v8 {
 namespace internal {
 
@@ skipping 70 matching lines @@
   }
 
   // 10. Let O be ? OrdinaryCreateFromConstructor(NewTarget,
   //     "%DataViewPrototype%", «[[DataView]], [[ViewedArrayBuffer]],
   //     [[ByteLength]], [[ByteOffset]]»).
   // 11. Set O's [[DataView]] internal slot to true.
   Handle<JSObject> result;
   ASSIGN_RETURN_FAILURE_ON_EXCEPTION(isolate, result,
                                      JSObject::New(target, new_target));
   for (int i = 0; i < ArrayBufferView::kInternalFieldCount; ++i) {
-    Handle<JSDataView>::cast(result)->SetInternalField(i, Smi::FromInt(0));
+    Handle<JSDataView>::cast(result)->SetInternalField(i, Smi::kZero);
   }
 
   // 12. Set O's [[ViewedArrayBuffer]] internal slot to buffer.
   Handle<JSDataView>::cast(result)->set_buffer(*array_buffer);
 
   // 13. Set O's [[ByteLength]] internal slot to viewByteLength.
   Handle<JSDataView>::cast(result)->set_byte_length(*view_byte_length);
 
   // 14. Set O's [[ByteOffset]] internal slot to offset.
   Handle<JSDataView>::cast(result)->set_byte_offset(*offset);
@@ skipping 226 matching lines @@
 DATA_VIEW_PROTOTYPE_SET(Int16, int16_t)
 DATA_VIEW_PROTOTYPE_SET(Uint16, uint16_t)
 DATA_VIEW_PROTOTYPE_SET(Int32, int32_t)
 DATA_VIEW_PROTOTYPE_SET(Uint32, uint32_t)
 DATA_VIEW_PROTOTYPE_SET(Float32, float)
 DATA_VIEW_PROTOTYPE_SET(Float64, double)
 #undef DATA_VIEW_PROTOTYPE_SET
 
 }  // namespace internal
 }  // namespace v8