[Bug target/86722] ifcvt produces x&0 that is never cleaned up

[rguenth at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=86722

--- Comment #1 from Richard Biener <rguenth at gcc dot gnu.org> ---
code-gen should go thorough simplify_gen_* which should perform constant
folding.