aco: insert p_end_wqm before p_jump_to_epilog
Otherwise, we can transition to exact before p_jump_to_epilog, then transition to WQM again and then back to exact:
p_jump_to_epilog //transitions to exact
p_logical_end //transitions to wqm
p_end_wqm //transitions to exact
We rely on ssa elimination to clean most of this up.
fossil-db (navi21):
Totals from 1 (0.00% of 79330) affected shaders:
Instrs: 111 -> 110 (-0.90%)
CodeSize: 572 -> 568 (-0.70%)
Copies: 16 -> 15 (-6.25%)