[Bug c/66842] libatomic uses multiple locks for locked atomics

[bin.x.fan at oracle dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=66842

--- Comment #2 from Bin Fan <bin.x.fan at oracle dot com> ---
I couldn't find a category for libatomic, and my understand is that C and C++
share libatomic library.

(In reply to Jonathan Wakely from comment #1)
> This obviously isn't a libstdc++ bug because you're not even using C++!