Fixed possible array out of bound access

[AndreyChurbanov]

Summary

There is low probability that array th_hot_teams can be accessed out of bound (when many nested levels are requested to keep hot teams via KMP_HOT_TEAMS_MAX_LEVEL). The patch adds the check of index, that fixes the problem.

[tlwilmar]

LGTM

openmp/trunk/runtime/src/kmp_runtime.cpp

if (__kmp_tasking_mode != tskm_immediate_exec) {
         }
         // Store master's task_state on stack
         master_th->th
             .th_task_state_memo_stack[master_th->th.th_task_state_top] =
             master_th->th.th_task_state;
         master_th->th.th_task_state_top++;
 #if KMP_NESTED_HOT_TEAMS
         if (master_th->th.th_hot_teams &&
+            active_level < __kmp_hot_teams_max_level &&
             team == master_th->th.th_hot_teams[active_level].hot_team) {
           // Restore master's nested state if nested hot team
           master_th->th.th_task_state =
               master_th->th
                   .th_task_state_memo_stack[master_th->th.th_task_state_top];
         } else {
 #endif
           master_th->th.th_task_state = 0;