[review] gdb/testsuite: Introduce compiler_supports_ctf_debug guard function

[Tom Tromey (Code Review)]

Tom Tromey has posted comments on this change.

Change URL: https://gnutoolchain-gerrit.osci.io/r/c/binutils-gdb/+/121
......................................................................


Patch Set 1:

> > I tend to suspect this should wait for the other patch (mentioned below).
> > What do you think?
> 
> That's fine.  I originally posted this to the m/l while back[1], I hadn't noticed that Nick had duplicated the work since then.  My main interest is the other two patches in this series.
> 
> [1] https://sourceware.org/ml/gdb-patches/2019-10/msg00220.html

If yours came first, I'm ok if you want to get it in earlier so you can
unblock your other patches.  I do think it should use `unsupported` though.

Thanks again for doing this.