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

src/builtins/builtins-math.cc

Index: src/builtins/builtins-math.cc
diff --git a/src/builtins/builtins-math.cc b/src/builtins/builtins-math.cc
index 29c87b4be2ab225849a046902e44e1f4ce8c9b20..ee531e4299e9e489c2e2d2348c109a209fa2737a 100644
--- a/src/builtins/builtins-math.cc
+++ b/src/builtins/builtins-math.cc
@@ -133,7 +133,7 @@ void Generate_MathRoundingOperation(
 
     // Check if {x} is a Smi or a HeapObject.
     Label if_xissmi(assembler), if_xisnotsmi(assembler);
-    assembler->Branch(assembler->WordIsSmi(x), &if_xissmi, &if_xisnotsmi);
+    assembler->Branch(assembler->TaggedIsSmi(x), &if_xissmi, &if_xisnotsmi);
 
     assembler->Bind(&if_xissmi);
     {
@@ -214,7 +214,7 @@ void Builtins::Generate_MathClz32(CodeStubAssembler* assembler) {
 
     // Check if {x} is a Smi or a HeapObject.
     Label if_xissmi(assembler), if_xisnotsmi(assembler);
-    assembler->Branch(assembler->WordIsSmi(x), &if_xissmi, &if_xisnotsmi);
+    assembler->Branch(assembler->TaggedIsSmi(x), &if_xissmi, &if_xisnotsmi);
 
     assembler->Bind(&if_xissmi);
     {