[stubs] Consolidate TryToName implementation

src/builtins/builtins-object.cc

Index: src/builtins/builtins-object.cc
diff --git a/src/builtins/builtins-object.cc b/src/builtins/builtins-object.cc
index c422145a51801214090e87c74e73d63a32f2850c..918eb7ef5c4119518449137a2beff7d458afc4b4 100644
--- a/src/builtins/builtins-object.cc
+++ b/src/builtins/builtins-object.cc
@@ -35,7 +35,7 @@ void Builtins::Generate_ObjectHasOwnProperty(CodeStubAssembler* assembler) {
   Node* map = assembler->LoadMap(object);
   Node* instance_type = assembler->LoadMapInstanceType(map);
 
-  Variable var_index(assembler, MachineRepresentation::kWord32);
+  Variable var_index(assembler, MachineType::PointerRepresentation());
 
   Label keyisindex(assembler), if_iskeyunique(assembler);
   assembler->TryToName(key, &keyisindex, &var_index, &if_iskeyunique,