[PATCH] libitm: Disable testing transaction-safe exceptions on Darwin and AIX.

[Torvald Riegel]

On Thu, 2016-01-21 at 10:06 -0800, Mike Stump wrote:
> On Jan 21, 2016, at 9:29 AM, Dominique d'Humières <dominiq@lps.ens.fr> wrote:
> > // { dg-do run { target { ! { *-*-darwin* powerpc-ibm-aix* } } } }
> 
> A comment to hint that this has something to do with weak undefined would be nice.

Here's the patch I prepared (which indeed includes a comment).

OK for trunk?  I'm not quite sure whether this qualifies as a
regression, but having an additional test that now fails is one I guess.
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