[Bug tree-optimization/126991] genmatch handling of cond^ should be improved

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

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=126991

--- Comment #1 from Drea Pinski <pinskia at gcc dot gnu.org> ---
Noticed when looking at the generated code for cond_carry_add (which I am
simplifying in the first place).