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

src/builtins/builtins-generator.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/code-factory.h"
 
 namespace v8 {
 namespace internal {
 
 namespace {
 
 void Generate_GeneratorPrototypeResume(
     CodeStubAssembler* assembler, JSGeneratorObject::ResumeMode resume_mode,
     char const* const method_name) {
   typedef CodeStubAssembler::Label Label;
   typedef compiler::Node Node;
 
   Node* receiver = assembler->Parameter(0);
   Node* value = assembler->Parameter(1);
   Node* context = assembler->Parameter(4);
   Node* closed =
       assembler->SmiConstant(Smi::FromInt(JSGeneratorObject::kGeneratorClosed));
 
   // Check if the {receiver} is actually a JSGeneratorObject.
   Label if_receiverisincompatible(assembler, Label::kDeferred);
-  assembler->GotoIf(assembler->WordIsSmi(receiver), &if_receiverisincompatible);
+  assembler->GotoIf(assembler->TaggedIsSmi(receiver),
+                    &if_receiverisincompatible);
   Node* receiver_instance_type = assembler->LoadInstanceType(receiver);
   assembler->GotoUnless(assembler->Word32Equal(
                             receiver_instance_type,
                             assembler->Int32Constant(JS_GENERATOR_OBJECT_TYPE)),
                         &if_receiverisincompatible);
 
   // Check if the {receiver} is running or already closed.
   Node* receiver_continuation = assembler->LoadObjectField(
       receiver, JSGeneratorObject::kContinuationOffset);
   Label if_receiverisclosed(assembler, Label::kDeferred),
@@ skipping 67 matching lines @@
 }
 
 // ES6 section 25.3.1.4 Generator.prototype.throw ( exception )
 void Builtins::Generate_GeneratorPrototypeThrow(CodeStubAssembler* assembler) {
   Generate_GeneratorPrototypeResume(assembler, JSGeneratorObject::kThrow,
                                     "[Generator].prototype.throw");
 }
 
 }  // namespace internal
 }  // namespace v8