[RFA]: test for backtrace failures in macro

[Jeff Johnston]

The following is a test for the change I recently made to allow macros to 
continue operating even after a backtrace failure occurs.

Tested on x86-linux with linuxthreads and ia64-linux with nptl threads.

Ok to commit?

-- Jeff J.

2004-11-05  Jeff Johnston  <jjohnstn@redhat.com>

         * gdb.threads/macrothreads.exp: New test.
         * gdb.threads/macrothreads.c: New file.

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