libstdc++/7926

[Loren James Rittle]

>I was/am expecting that generic/atomicity.h would be fixed to use gthr.h's
>mutexes before 3.2.1 is shipped...

As long as the patch to fix i386 isn't moved to release branch before
generic/atomicity.h is updated to make correct rather than fast,
I guess my complaints are withdrawn.  It would still be nice to
figure out correct code for plain i386 that also worked on later iX86
and SMP configurations, but that is outside my area (I posted one
example to start discussion).

Regards,
Loren