[Bug libstdc++/65147] alignment of std::atomic object is not correct

[redi at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=65147

--- Comment #12 from Jonathan Wakely <redi at gcc dot gnu.org> ---
Alexey, your testcases in comment 0 and comment 7 give the right results now.