[Bug middle-end/66881] Possibly inefficient std::atomic codegen on x86 for simple arithmetic

[ville.voutilainen at gmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=66881

--- Comment #2 from Ville Voutilainen <ville.voutilainen at gmail dot com> ---
(In reply to H.J. Lu from comment #1)
> Dup of PR 50677?

Well, this report has no volatiles in it, so perhaps not?