[Bug tree-optimization/126042] -O2 -fno-trapping-math makes worse code than with trapping math for `<=>`

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

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=126042

--- Comment #3 from Drea Pinski <pinskia at gcc dot gnu.org> ---
(In reply to Drea Pinski from comment #2)
> But really combine_comparisons should be used. But that returns a tree. I am
> going to change it to return a tree_code.

I have to figure out the best tree code to use for constant values of true and
false. I am thinking MIN_EXPR (false) and MAX_EXPR (true).