Function doThreadShutdownNotification

* When a thread is shutting down this routine should be called to remove all the thread ids * from the malloc blocks and replace them with a nullptr thread id. * * For pthreads, the function is set as a callback in pthread_key_create for TLS bin. * It will be automatically called at thread exit with the key value as the argument, * unless that value is nullptr. * For Windows, it is called fr