This folds away subs(csel(1, 0, cc)) from brcond, that can be produced in certain places from compares that are not already subs (like adc/sbc generated from i128 add_with_overflow intrinsics).
This folds away subs(csel(1, 0, cc)) from brcond, that can be produced in certain places from compares that are not already subs (like adc/sbc generated from i128 add_with_overflow intrinsics).