[Bug tree-optimization/127654] Neg/BIT_NOT should be factored out even with constants

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

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=127654

--- Comment #4 from Drea Pinski <pinskia at gcc dot gnu.org> ---
(In reply to Drea Pinski from comment #3)
> Created attachment 65718 [details]
> Patch which I am testing

Note this patch needs testcases and a better commit log.  

This is the alternative to
https://gcc.gnu.org/pipermail/gcc-patches/2026-July/724647.html .