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

[barry.revzin at gmail dot com]

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

--- Comment #8 from Barry Revzin <barry.revzin at gmail dot com> ---
-D_GLIBCXX_USE_CXX11_ABI=0 doesn't matter. It's just that I'd compiled google
benchmark with 4.8, and then wanted to test this behavior with 5.4 and 6.2. It
has no impact on the generated assembly as far as I could tell.