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The thread group info is not sufficient to represent a thread group's current state as it's read-only. We also need something comparable to the thread context to represent the aggregate state of the threads in that group. This patch introduces ha_tgroup_ctx[] and tg_ctx for this. It's indexed on the group id and must be cache-line aligned. The thread masks that were global and that do not need to remain global were moved there (want_rdv, harmless, idle). Given that all the masks placed there now become group-specific, the associated thread mask (tid_bit) now switches to the thread's local bit (ltid_bit). Both are the same for nbtgroups 1 but will differ for other values. There's also a tg_ctx pointer in the thread so that it can be reached from other threads.