[Bug tree-optimization/125641] `a>>signbit | a` is just `max<a, -1>`

[kaelfandrew at gmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=125641

--- Comment #6 from Kael Franco <kaelfandrew at gmail dot com> ---
https://gcc.gnu.org/pipermail/gcc-patches/2026-June/719872.html