Fix dwarf2 signal unwind regressions

[David S. Miller]

   From: Alexandre Oliva <aoliva@redhat.com>
   Date: 03 May 2002 02:48:35 -0300

   On May  2, 2002, "David S. Miller" <davem@redhat.com> wrote:
   
   > Alexander Oliva is currently making sure this also makes the
   > RedHat-6.2 Sparc bootstrap regression go away (this is
   > PR bootstrap/6525).
   
   Bootstrap on Red Hat Linux 6.2/sparc has just completed.

Any chance I can convince you to:

make -k check
../gcc/contrib/test_summary | sh

now? :-)