[Bug c++/85720] bad codegen for looped assignment of primitives at -O2

[pinskia at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85720

--- Comment #1 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
That is because -ftree-loop-distribute-patterns is turned on only for -O3 and
above.