[Bug c/61053] [4.9/4.10 Regression] _Alignas(long long) reduces alignment of long long

[mpolacek at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=61053

--- Comment #6 from Marek Polacek <mpolacek at gcc dot gnu.org> ---
I'm about to backport the fix even into 4.9 branch, thanks.