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

src/code-stub-assembler.h

Index: src/code-stub-assembler.h
diff --git a/src/code-stub-assembler.h b/src/code-stub-assembler.h
index 080791dc93133132cf606ec29c53d824db0408fd..e008a07a7452e7a00bc74008ccf9783d61178278 100644
--- a/src/code-stub-assembler.h
+++ b/src/code-stub-assembler.h
@@ -150,7 +150,7 @@ class CodeStubAssembler : public compiler::CodeAssembler {
   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);