[Bug rtl-optimization/78116] [7/8 regression] Performance drop after r241173 on avx512 target

[andrew.n.senkevich at gmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=78116

--- Comment #18 from Andrew Senkevich <andrew.n.senkevich at gmail dot com> ---
Created pr80481.