[s390 patch] Improved backtrace for s390*

[Matthias Klose <doko@cs.tu-berlin.de>]

This patch applied upstream
http://sources.redhat.com/ml/libc-hacker/2003-12/msg00025.html
is supposed to fix about 900 test failures in the libjava testsuite in
gcc-3.4. Note that I didn't test the patch myself.

	Matthias

Compare the Debian test results
http://gcc.gnu.org/ml/gcc-testresults/2004-03/msg00816.html

	=== libjava Summary ===

  # of expected passes		1487
  # of unexpected failures	900
  # of expected failures	4
  # of untested testcases	908

with Ulrich's test results
http://gcc.gnu.org/ml/gcc-testresults/2004-04/msg00098.html

		=== libjava Summary ===

  # of expected passes		3259
  # of unexpected failures	2
  # of expected failures	11
  # of untested testcases	8