[Bug tree-optimization/126043] early phiopt should allow CMP, (cast)CMP, -(cast)CMP

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

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=126043

--- Comment #4 from Drea Pinski <pinskia at gcc dot gnu.org> ---
>fold-xor-and-or, fold-xor-or
Actually those are slightly more complex than just :c but I think I have a
patch.