[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 #7 from Yuri Rumyantsev <ysrumyan at gmail dot com> ---
Compiler was configures with:

Configured with: <dir-name>/configure --enable-languages=c,c++
--enable-clocale=gnu --enable-cloog-backend=isl --enable-shared
--disable-libsanitizer --disable-bootstrap --disable-nls --with-system-zlib
--with-demangler-in-ld --with-arch=corei7 --with-cpu=corei7 --with-fpmath=sse
--prefix=<dir-name>/install
Thread model: posix
gcc version 7.0.0 20161014 (experimental) (GCC)

I assume that arch and cpu are not essential.