[Bug libstdc++/99306] cross compiler bootstrap failure on msdosdjgpp: error: alignment of 'm' is greater than maximum object file alignment 16

[redi at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=99306

--- Comment #3 from Jonathan Wakely <redi at gcc dot gnu.org> ---
It's intended to be the cacheline size, so would use
std::hardware_destructive_interference_size, but that's not implemented yet for
the reasons given in PR 88466. And also because it's just a very verbose way to
say 64 :-P