[BOLT] fixing th_active management

An OpenMP thread that has finished its work should help run tasks in the same
team, while it did not happen since such a thread remains "active".  This patch
fixes it by marking a thread as inactive when it finishes.

runtime/src/z_Linux_util.cpp

@@ -670,6 +670,9 @@ static void __kmp_abt_launch_worker(void *thr) {
     td->td_tq_max_size = 0;
   }
 
+  /* This thread has been finished. Any task can use this as a parent. */
+  __kmp_abt_release_info(this_thr);
+
   if (end_tid - start_tid > 1)
     __kmp_abt_join_workers_recursive(team, start_tid, end_tid);