[Bug libstdc++/86471] GCC/libstdc++ outputs inferior code for std::fill and std::fill_n vs std::memset on c-style arrays

[pinskia at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=86471

--- Comment #1 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
Does -O3 bring the performance back?  -O3 enables loop distrubtion which should
be able to detect these loops.