[PING][PATCH v2] Fix mutex pretty printer test and pretty printer output

[Torvald Riegel]

On Fri, 2017-01-20 at 09:57 -0300, Martin Galvan wrote:
> This is a new version of the patch Torvald posted here:
> 
> https://www.sourceware.org/ml/libc-alpha/2017-01/msg00169.html
> 
> This fixes the mutex pretty printer so that, if the owner ID isn't recorded
> (such as in the current lock elision implementation), "Owner ID" will be shown
> as "Unknown" instead of 0. It also changes the mutex printer output so that it says
> "Acquired" instead of "Locked". The mutex tests are updated accordingly.
> 
> In addition, I've added a paragraph to the "Known issues" section of the printers
> README explaining that the printer output isn't guaranteed to cover every detail,
> as we discussed with Torvald in that same thread.
> 
> I don't have write access, so somebody should commit this for me. Thanks.

Thanks.  Committed.