[Bug libstdc++/55233] libstdc++ atomic does not support hle_acquire/release

[redi at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=55233

--- Comment #6 from Jonathan Wakely <redi at gcc dot gnu.org> ---
(In reply to Jonathan Wakely from comment #5)
> I think this change is broken for -fshort-enums because the
> std::memory_order enum will be a single byte, and not be able to store the
> HLE bits.

That's now PR 89624.