[stubs] Renames WordIsSmi to TaggedIsSmi, introducing an appropriate bitcast of the parameter.

src/builtins/builtins-date.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"
 
 #include "src/dateparser-inl.h"
 
 namespace v8 {
@@ skipping 901 matching lines @@
 void Builtins::Generate_DatePrototype_GetField(CodeStubAssembler* assembler,
                                                int field_index) {
   typedef CodeStubAssembler::Label Label;
   typedef compiler::Node Node;
 
   Node* receiver = assembler->Parameter(0);
   Node* context = assembler->Parameter(3);
 
   Label receiver_not_date(assembler, Label::kDeferred);
 
-  assembler->GotoIf(assembler->WordIsSmi(receiver), &receiver_not_date);
+  assembler->GotoIf(assembler->TaggedIsSmi(receiver), &receiver_not_date);
   Node* receiver_instance_type = assembler->LoadInstanceType(receiver);
   assembler->GotoIf(
       assembler->Word32NotEqual(receiver_instance_type,
                                 assembler->Int32Constant(JS_DATE_TYPE)),
       &receiver_not_date);
 
   // Load the specified date field, falling back to the runtime as necessary.
   if (field_index == JSDate::kDateValue) {
     assembler->Return(
         assembler->LoadObjectField(receiver, JSDate::kValueOffset));
@@ skipping 123 matching lines @@
 }
 
 // static
 void Builtins::Generate_DatePrototypeGetUTCSeconds(
     CodeStubAssembler* assembler) {
   Generate_DatePrototype_GetField(assembler, JSDate::kSecondUTC);
 }
 
 }  // namespace internal
 }  // namespace v8