[Bug libstdc++/61458] std::aligned_storage is bigger than expected

[redi at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=61458

--- Comment #3 from Jonathan Wakely <redi at gcc dot gnu.org> ---
P.S. this isn't an urgent problem for the library, as we don't use
aligned_storage<N> internally, we always use __aligned_buffer<T> which
specifies the alignment explicitly rather than relying on the 16-byte default.