[Bug libstdc++/102984] strange alignment issues with std::vector::emplace/push_back and overaligned type

[redi at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=102984

--- Comment #5 from Jonathan Wakely <redi at gcc dot gnu.org> ---
This is probably the _Temporary_value helper used by std::vector. I already
have a patch to overhaul that so it works in constant expressions, so I'll fix
this too