Add Object::IsNullOrUndefined(Isolate*) helper method

src/compiler/js-call-reducer.cc

Index: src/compiler/js-call-reducer.cc
diff --git a/src/compiler/js-call-reducer.cc b/src/compiler/js-call-reducer.cc
index 62ee929af6336cf7e140b2b7138277d25318ab59..1caf65da0147481f793bd8df8eb93d97a8a90e48 100644
--- a/src/compiler/js-call-reducer.cc
+++ b/src/compiler/js-call-reducer.cc
@@ -456,7 +456,7 @@ Reduction JSCallReducer::ReduceJSCallFunction(Node* node) {
                                          isolate());
       CallFunctionParameters const& p = CallFunctionParametersOf(node->op());
       ConvertReceiverMode const convert_mode =
-          (bound_this->IsNull(isolate()) || bound_this->IsUndefined(isolate()))
+          (bound_this->IsNullOrUndefined(isolate()))
               ? ConvertReceiverMode::kNullOrUndefined
               : ConvertReceiverMode::kNotNullOrUndefined;
       size_t arity = p.arity();