[cpp-threads] Belated comments on N2052

[Peter Dimov]

Nelson, Clark wrote:

>> and the comment "x may be incremented only once" looks wrong.
> 
> I'm not sure what you mean by "looks wrong". In response to other
> feedback I've received, the comment now reads, "Effect of inc_x may be
> lost: call may occur between load and store of x". From your
> perspective, is that better or worse?

I find this reformulation much clearer; thanks.