aco: execute branch instructions in WQM if necessary
It could happen that only the branch condition was computed in WQM and not the branch instruction. There is now some rendundancy which should be cleaned up. Fixes: 3817fa7a ('aco: fix WQM handling in nested loops') Reviewed-by:Rhys Perry <pendingchaos02@gmail.com> Part-of: <mesa/mesa!6260> (cherry picked from commit fdb97d3d)