[Bug libstdc++/114865] [13/14/15 Regression] std::atomic::compare_exchange_strong seems to hang under GCC 13 for C++11

[redi at gcc dot gnu.org via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=114865

--- Comment #16 from Jonathan Wakely <redi at gcc dot gnu.org> ---
Alternatively, we could skip all the padding cope in compare_exchange for
C++11, since that was a C++20 change and not a DR.