Add Object::IsNullOrUndefined(Isolate*) helper method

src/builtins/builtins-object.cc

 // Copyright 2016 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/builtins/builtins-utils.h"
 #include "src/builtins/builtins.h"
 #include "src/code-factory.h"
 #include "src/code-stub-assembler.h"
 #include "src/property-descriptor.h"
 
@@ skipping 618 matching lines @@
   RETURN_RESULT_OR_FAILURE(isolate,
                            JSReceiver::GetPrototype(isolate, receiver));
 }
 
 // ES6 section 19.1.2.21 Object.setPrototypeOf ( O, proto )
 BUILTIN(ObjectSetPrototypeOf) {
   HandleScope scope(isolate);
 
   // 1. Let O be ? RequireObjectCoercible(O).
   Handle<Object> object = args.atOrUndefined(isolate, 1);
-  if (object->IsNull(isolate) || object->IsUndefined(isolate)) {
+  if (object->IsNullOrUndefined(isolate)) {
     THROW_NEW_ERROR_RETURN_FAILURE(
         isolate, NewTypeError(MessageTemplate::kCalledOnNullOrUndefined,
                               isolate->factory()->NewStringFromAsciiChecked(
                                   "Object.setPrototypeOf")));
   }
 
   // 2. If Type(proto) is neither Object nor Null, throw a TypeError exception.
   Handle<Object> proto = args.atOrUndefined(isolate, 2);
   if (!proto->IsNull(isolate) && !proto->IsJSReceiver()) {
     THROW_NEW_ERROR_RETURN_FAILURE(
@@ skipping 25 matching lines @@
   // 2. Return ? O.[[GetPrototypeOf]]().
   RETURN_RESULT_OR_FAILURE(isolate,
                            JSReceiver::GetPrototype(isolate, receiver));
 }
 
 // ES6 section B.2.2.1.2 set Object.prototype.__proto__
 BUILTIN(ObjectPrototypeSetProto) {
   HandleScope scope(isolate);
   // 1. Let O be ? RequireObjectCoercible(this value).
   Handle<Object> object = args.receiver();
-  if (object->IsNull(isolate) || object->IsUndefined(isolate)) {
+  if (object->IsNullOrUndefined(isolate)) {
     THROW_NEW_ERROR_RETURN_FAILURE(
         isolate, NewTypeError(MessageTemplate::kCalledOnNullOrUndefined,
                               isolate->factory()->NewStringFromAsciiChecked(
                                   "set Object.prototype.__proto__")));
   }
 
   // 2. If Type(proto) is neither Object nor Null, return undefined.
   Handle<Object> proto = args.at(1);
   if (!proto->IsNull(isolate) && !proto->IsJSReceiver()) {
     return isolate->heap()->undefined_value();
@@ skipping 289 matching lines @@
   CodeStubAssembler assembler(state);
 
   Node* object = assembler.Parameter(Descriptor::kObject);
   Node* context = assembler.Parameter(Descriptor::kContext);
 
   assembler.Return(assembler.GetSuperConstructor(object, context));
 }
 
 }  // namespace internal
 }  // namespace v8