[Bug libstdc++/105258] std::get_temporary_buffer() does not respect alignment (affects std::stable_sort())

[redi at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=105258

--- Comment #1 from Jonathan Wakely <redi at gcc dot gnu.org> ---
The simplest solution would be to just use std::allocator<T> which already does
the right thing, but that would break if there is a program-defined
specialization of std::allocator<T>.