Add Object::IsNullOrUndefined(Isolate*) helper method

src/runtime/runtime-regexp.cc

 // Copyright 2014 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.
 
 #include "src/runtime/runtime-utils.h"
 
 #include "src/arguments.h"
 #include "src/conversions-inl.h"
 #include "src/isolate-inl.h"
 #include "src/messages.h"
@@ skipping 1280 matching lines @@
   }
 
   Handle<JSReceiver> ctor = Handle<JSReceiver>::cast(ctor_obj);
 
   Handle<Object> species;
   ASSIGN_RETURN_ON_EXCEPTION(
       isolate, species,
       JSObject::GetProperty(ctor, isolate->factory()->species_symbol()),
       Object);
 
-  if (species->IsNull(isolate) || species->IsUndefined(isolate)) {
+  if (species->IsNullOrUndefined(isolate)) {
     return default_ctor;
   }
 
   if (species->IsConstructor()) return species;
 
   THROW_NEW_ERROR(
       isolate, NewTypeError(MessageTemplate::kSpeciesNotConstructor), Object);
 }
 
 MUST_USE_RESULT MaybeHandle<Object> ToUint32(Isolate* isolate,
@@ skipping 366 matching lines @@
 
 RUNTIME_FUNCTION(Runtime_IsRegExp) {
   SealHandleScope shs(isolate);
   DCHECK_EQ(1, args.length());
   CONVERT_ARG_CHECKED(Object, obj, 0);
   return isolate->heap()->ToBoolean(obj->IsJSRegExp());
 }
 
 }  // namespace internal
 }  // namespace v8