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

src/code-stub-assembler.h

 // 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.
 
 #ifndef V8_CODE_STUB_ASSEMBLER_H_
 #define V8_CODE_STUB_ASSEMBLER_H_
 
 #include <functional>
 
 #include "src/compiler/code-assembler.h"
@@ skipping 132 matching lines @@
   // Allocate an object of the given size.
   compiler::Node* Allocate(compiler::Node* size, AllocationFlags flags = kNone);
   compiler::Node* Allocate(int size, AllocationFlags flags = kNone);
   compiler::Node* InnerAllocate(compiler::Node* previous, int offset);
   compiler::Node* InnerAllocate(compiler::Node* previous,
                                 compiler::Node* offset);
 
   void Assert(compiler::Node* condition);
 
   // Check a value for smi-ness
-  compiler::Node* WordIsSmi(compiler::Node* a);
+  compiler::Node* TaggedIsSmi(compiler::Node* a);
   // Check that the value is a non-negative smi.
   compiler::Node* WordIsPositiveSmi(compiler::Node* a);
 
   void BranchIfSmiEqual(compiler::Node* a, compiler::Node* b, Label* if_true,
                         Label* if_false) {
     BranchIf(SmiEqual(a, b), if_true, if_false);
   }
 
   void BranchIfSmiLessThan(compiler::Node* a, compiler::Node* b, Label* if_true,
                            Label* if_false) {
@@ skipping 794 matching lines @@
                                            Label* bailout);
 
   static const int kElementLoopUnrollThreshold = 8;
 };
 
 DEFINE_OPERATORS_FOR_FLAGS(CodeStubAssembler::AllocationFlags);
 
 }  // namespace internal
 }  // namespace v8
 #endif  // V8_CODE_STUB_ASSEMBLER_H_