[Bug rtl-optimization/125757] `smax <smin <a, nonneg>, 0>` can be simplified into `umin<a, nonneg>`

[pinskia at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=125757

--- Comment #1 from Drea Pinski <pinskia at gcc dot gnu.org> ---
Note the order of min/max can be reversed and still have the same effect.