Add Object::IsNullOrUndefined(Isolate*) helper method

src/string-stream.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/string-stream.h"
 
 #include <memory>
 
 #include "src/handles-inl.h"
 #include "src/prototype.h"
@@ skipping 463 matching lines @@
     Add("%o", f);
     Add("/* warning: no JSFunction object or function name found */ ");
   }
 }
 
 
 void StringStream::PrintPrototype(JSFunction* fun, Object* receiver) {
   Object* name = fun->shared()->name();
   bool print_name = false;
   Isolate* isolate = fun->GetIsolate();
-  if (receiver->IsNull(isolate) || receiver->IsUndefined(isolate) ||
-      receiver->IsTheHole(isolate) || receiver->IsJSProxy()) {
+  if (receiver->IsNullOrUndefined(isolate) || receiver->IsTheHole(isolate) ||
+      receiver->IsJSProxy()) {
     print_name = true;
   } else if (isolate->context() != nullptr) {
     if (!receiver->IsJSObject()) {
       receiver = receiver->GetPrototypeChainRootMap(isolate)->prototype();
     }
 
     for (PrototypeIterator iter(isolate, JSObject::cast(receiver),
                                 kStartAtReceiver);
          !iter.IsAtEnd(); iter.Advance()) {
       if (iter.GetCurrent()->IsJSProxy()) break;
@@ skipping 36 matching lines @@
   MemCopy(new_space, space_, *bytes);
   *bytes = new_bytes;
   DeleteArray(space_);
   space_ = new_space;
   return new_space;
 }
 
 
 }  // namespace internal
 }  // namespace v8