[Bug middle-end/106819] [13 Regression] NaN != NaN comparisons return false at -O2 since r13-2338

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

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=106819

--- Comment #11 from Aldy Hernandez <aldyh at gcc dot gnu.org> ---
I'll just fix union and implement copysign folding and leave it at that.