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* Serial teams now use a stack (similar to dispatch buffers) * Serial teams always use `t_task_team[0]` as the task team and the second pointer is a next pointer for the stack `t_task_team[1]` is interpreted as a stack of task teams where each level is a nested level ``` inner serial team outer serial team [ t_task_team[0] ] -> (task_team) [ t_task_team[0] ] -> (task_team) [ next ] ----------------> [ next ] -> ... ``` * Remove the task state memo stack from thread structure. * Instead of a thread-private stack, use team structure to store th_task_state of the primary thread. When coming out of a parallel, restore the primary thread's task state. The new field in the team structure doesn't cause sizeof(team) to change and is in the cache line which is only read/written by the primary thread. Fixes: #50602 Fixes: #69368 Fixes: #69733 Fixes: #79416