Help needed for glibc software transaction memory algorithm

[Florian Weimer]

* Szabolcs Nagy:

> this reminds me the discussion in section 4 and 5 of
>
> https://www.hpl.hp.com/techreports/2012/HPL-2012-68.pdf
>
> there are no 2 data copies here but i think the reasoning
> about the synchronization may apply.

Yes, I'll reference that and put in the acquire fence.  Thanks.

Florian