[Bug tree-optimization/68718] libgomp c.exp with -fipa-pta hang in sort-1.c

[rguenth at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=68718

--- Comment #6 from Richard Biener <rguenth at gcc dot gnu.org> ---
(In reply to Jakub Jelinek from comment #4)
> omp_set/unset_lock of course is a memory barrier.

It is _not_ for the stack-local in main (which IPA PTA exposes).