[Bug tree-optimization/128521] `x ord x` can be treated as `x ord CST` when combining with `x CMP CST`

[pinskia at gcc dot gnu.org via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=128521

--- Comment #1 from Drea Pinski <pinskia at gcc dot gnu.org> ---
I should mention as long as CST is not a NaN but I thought that would be
obvious :).