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

[ysrumyan at gmail dot com]

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

--- Comment #5 from Yuri Rumyantsev <ysrumyan at gmail dot com> ---
Yes, some virtual register are allocated on stack and we got more loads from
stack to get their values.