[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);
 
@@ -1197,6 +1200,11 @@ void __kmp_abt_join_workers(kmp_team_t *team) {
     // is reused in the future. BOLT cannot run tasks on top of implicit tasks,
     // so such an inconsistency problem occurs.
     th->th.th_current_task = &team->t.t_implicit_task_taskdata[tid];
+    // Reset threads so that tasks cannot use these threads.
+    KMP_DEBUG_ASSERT(th->th.th_active == FALSE);
+    if (tid != 0) {
+      th->th.th_active = TRUE;
+    }
   }
 } // __kmp_abt_join_workers