Failures on Debian-s390x-native-gdbserver-m64, branch gdb-8.1-branch

[sergiodj+buildbot@sergiodj.net]

Buildslave:
	debian-jessie-s390x-1

Full Build URL:
	<http://gdb-build.sergiodj.net/builders/Debian-s390x-native-gdbserver-m64/builds/5058>

Commit(s) tested:
	55404da3795df1b5eff514ce9d0377b6a78e5904

Author(s) (in the same order as the commits):
	Jan Kratochvil <jan.kratochvil@redhat.com>

Subject:
	Fix -D_GLIBCXX_DEBUG gdb-add-index regression

Testsuite log (gdb.sum and gdb.log) URL(s):
	<http://gdb-build.sergiodj.net/results/Debian-s390x-native-gdbserver-m64/55/55404da3795df1b5eff514ce9d0377b6a78e5904/>