Revert of Replace all remaining Oddball checks with new function

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 "src/handles-inl.h"
 #include "src/prototype.h"
 
 namespace v8 {
@@ skipping 509 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) ||
+  if (receiver->IsNull() || receiver->IsUndefined(isolate) ||
       receiver->IsJSProxy()) {
     print_name = true;
   } else if (isolate->context() != nullptr) {
     if (!receiver->IsJSObject()) {
       receiver = receiver->GetRootMap(isolate)->prototype();
     }
 
     for (PrototypeIterator iter(isolate, JSObject::cast(receiver),
                                 kStartAtReceiver);
          !iter.IsAtEnd(); iter.Advance()) {
@@ skipping 37 matching lines @@
   MemCopy(new_space, space_, *bytes);
   *bytes = new_bytes;
   DeleteArray(space_);
   space_ = new_space;
   return new_space;
 }
 
 
 }  // namespace internal
 }  // namespace v8