[rfa/testsuite] Extend signull to work with discriptors

[Andrew Cagney]

>>We're going to have to live with this - the testsuite needs to include 
>>> deliberately erroneous programs.
> 
> 
> Yeah, I see what you're saying, and I agree.  It's not like the test
> program is gratuitously non-conforming.  You need this 'desc' to do what
> it's doing in order to test what you're testing.
> 
> Can you add one more comment?  Something like:
> 
>   /* desc is intentionally initialized to a data object.
>      This is needed to test descriptors on arches like ia64.  */

stolen :-)

> It's the old "move the mailing list discussion into a comment" request.
> 
> With a comment like this, this patch is approved.  (And also maybe you
> have better wording for the comment than I can think of).

committed the attached,
Andrew

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