[Bug tree-optimization/91540] Missed optimization: simplification CFG

[zamazan4ik at tut dot by]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=91540

--- Comment #1 from Alexander Zaitsev <zamazan4ik at tut dot by> ---
Godbolt playground: https://godbolt.org/z/MFSH1D