[Bug libstdc++/111077] atomic_ref compare_exchange_strong doesn't properly ignore padding bits

[pinskia at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=111077

--- Comment #4 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
reading through all of these discussions almost want to say the paper on
atomic_ref and padding bits of compare_and_exchange still missed the point of
this issue. Maybe this is undefined and maybe this is defect in the library
part of C++ standard even ...