[api] Fix IsSimpleInstantion check in InstantiatObject

We have a simple instantiation at hand if the new.target is from the same
context, not the other way around.

BUG=chromium:630217

Review-Url: https://codereview.chromium.org/2201113002
Cr-Commit-Position: refs/heads/master@{#38279}

src/api-natives.cc

@@ -334,8 +334,7 @@ bool IsSimpleInstantiation(Isolate* isolate, ObjectTemplateInfo* info,
   JSFunction* fun = JSFunction::cast(new_target);
   if (fun->shared()->function_data() != info->constructor()) return false;
   if (info->immutable_proto()) return false;
-  return fun->context()->native_context() !=
-         isolate->context()->native_context();
+  return fun->context()->native_context() == isolate->raw_native_context();
 }
 
 MaybeHandle<JSObject> InstantiateObject(Isolate* isolate,