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

[pthaugen at gcc dot gnu.org]

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

--- Comment #12 from Pat Haugen <pthaugen at gcc dot gnu.org> ---
Now that pr77536 has been fixed can this issue be closed? The first testcase no
longer has any loads from the stack in the loop, but does have 4 reg copies
that seem like they could get cleaned up (RA/reload issue as Bin mentioned?).
The second testcase is totally cleaned up.