[libcxxabi] r221348 - Disable backtrace libcxxabi test on ARM

[Renato Golin]

On 6 November 2014 15:54, Jonathan Roelofs <jonathan at codesourcery.com> wrote:
> That should work, though unfortunately it means we expect the whole file to
> fail, so we don't get the feedback from the part that does pass at the
> moment.

But the whole test fails at the moment, since both results are
compared in the end. I'll change it to XFAIL.

cheers,
--renato