Replace all remaining Oddball checks with new function

src/runtime/runtime-classes.cc

Index: src/runtime/runtime-classes.cc
diff --git a/src/runtime/runtime-classes.cc b/src/runtime/runtime-classes.cc
index 37a5122cec3b6c0c6a2c5d45bc5768498340e930..303122fc3967c5f3abfc9a088885c958457aac98 100644
--- a/src/runtime/runtime-classes.cc
+++ b/src/runtime/runtime-classes.cc
@@ -91,7 +91,7 @@ static MaybeHandle<Object> DefineClass(Isolate* isolate,
   if (super_class->IsTheHole(isolate)) {
     prototype_parent = isolate->initial_object_prototype();
   } else {
-    if (super_class->IsNull()) {
+    if (super_class->IsNull(isolate)) {
       prototype_parent = isolate->factory()->null_value();
     } else if (super_class->IsConstructor()) {
       DCHECK(!super_class->IsJSFunction() ||
@@ -101,7 +101,8 @@ static MaybeHandle<Object> DefineClass(Isolate* isolate,
           Runtime::GetObjectProperty(isolate, super_class,
                                      isolate->factory()->prototype_string()),
           Object);
-      if (!prototype_parent->IsNull() && !prototype_parent->IsJSReceiver()) {
+      if (!prototype_parent->IsNull(isolate) &&
+          !prototype_parent->IsJSReceiver()) {
         THROW_NEW_ERROR(
             isolate, NewTypeError(MessageTemplate::kPrototypeParentNotAnObject,
                                   prototype_parent),