vn_syncer_add_to_worklist
vn_syncer_add_to_worklist(*bo, syncdelay);
vn_syncer_add_to_worklist(bo, delay);
vn_syncer_add_to_worklist(bo, syncdelay > 0 ? next % syncdelay : 0);
vn_syncer_add_to_worklist(bo, syncdelay);