[Bug middle-end/102566] [i386] GCC should emit LOCK BTS for simple bit-test-and-set operations with std::atomic

[hjl.tools at gmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=102566

--- Comment #23 from H.J. Lu <hjl.tools at gmail dot com> ---
(In reply to Thiago Macieira from comment #22)
> (In reply to H.J. Lu from comment #21)
> > Created attachment 51559 [details]
> > The new v3 patch
> > 
> > The new v3 patch to check invalid mask.
> 
> v3? We were already up to v6.

I renamed the commit title.  The new v3 is the v6 + fixes.