Add Object::IsNullOrUndefined(Isolate*) helper method

src/builtins/builtins-array.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.h"
 #include "src/builtins/builtins-utils.h"
 
 #include "src/code-factory.h"
 #include "src/code-stub-assembler.h"
 #include "src/contexts.h"
@@ skipping 15 matching lines @@
     if (std::isnan(value)) {
       *out = 0;
     } else if (value > kMaxInt) {
       *out = kMaxInt;
     } else if (value < kMinInt) {
       *out = kMinInt;
     } else {
       *out = static_cast<int>(value);
     }
     return true;
-  } else if (object->IsUndefined(isolate) || object->IsNull(isolate)) {
+  } else if (object->IsNullOrUndefined(isolate)) {
     *out = 0;
     return true;
   } else if (object->IsBoolean()) {
     *out = object->IsTrue(isolate);
     return true;
   }
   return false;
 }
 
 inline bool GetSloppyArgumentsLength(Isolate* isolate, Handle<JSObject> object,
@@ skipping 1289 matching lines @@
 }
 
 }  // namespace
 
 // ES6 22.1.3.1 Array.prototype.concat
 BUILTIN(ArrayConcat) {
   HandleScope scope(isolate);
 
   Handle<Object> receiver = args.receiver();
   // TODO(bmeurer): Do we really care about the exact exception message here?
-  if (receiver->IsNull(isolate) || receiver->IsUndefined(isolate)) {
+  if (receiver->IsNullOrUndefined(isolate)) {
     THROW_NEW_ERROR_RETURN_FAILURE(
         isolate, NewTypeError(MessageTemplate::kCalledOnNullOrUndefined,
                               isolate->factory()->NewStringFromAsciiChecked(
                                   "Array.prototype.concat")));
   }
   ASSIGN_RETURN_FAILURE_ON_EXCEPTION(
       isolate, receiver, Object::ToObject(isolate, args.receiver()));
   args[0] = *receiver;
 
   Handle<JSArray> result_array;
@@ skipping 1389 matching lines @@
     Node* message = assembler.SmiConstant(MessageTemplate::kDetachedOperation);
     Node* result =
         assembler.CallRuntime(Runtime::kThrowTypeError, context, message,
                               assembler.HeapConstant(operation));
     assembler.Return(result);
   }
 }
 
 }  // namespace internal
 }  // namespace v8