The walk for cleaning packages and modules was moved to another function but left in ClassLoaderData::do_unloading() with the SymbolTable merge.
Also SymbolTable::do_check_concurrent_work() to SystemDictionary::do_unloading() for future work on concurrent class unloading.
Also SymbolTable::do_check_concurrent_work() to SystemDictionary::do_unloading() for future work on concurrent class unloading.