[Bug middle-end/69553] [6 Regression] Optimizations O1/O2 makes std::array value incorrect when passed to function

[trippels at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=69553

--- Comment #5 from Markus Trippelsdorf <trippels at gcc dot gnu.org> ---
I think the real culprit is r228679. 
Honza?