Failures on Fedora-ppc64le-native-extended-gdbserver-m64, branch master

[sergiodj+buildbot@sergiodj.net]

Buildslave:
	fedora-ppc64le-1

Full Build URL:
	<http://gdb-build.sergiodj.net/builders/Fedora-ppc64le-native-extended-gdbserver-m64/builds/5213>

Commit(s) tested:
	568c1b9f503649d19ed1d17e6970f212e6b6317d

Author(s) (in the same order as the commits):
	Pádraig Brady <pbrady@fb.com>

Subject:
	Avoid segfault on invalid directory table

Testsuite log (gdb.sum and gdb.log) URL(s):
	<http://gdb-build.sergiodj.net/results/Fedora-ppc64le-native-extended-gdbserver-m64/56/568c1b9f503649d19ed1d17e6970f212e6b6317d/>