[Bug middle-end/78180] Poor optimization of std::array on gcc 4.8/5.4/6.2 as compared to simple raw array

[pinskia at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=78180

--- Comment #5 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
Does -D_GLIBCXX_USE_CXX11_ABI=0 change the code or not?  I don't know if we
want to change any of the old ABI code ...