Failures on Fedora-s390x-m64, branch master

[sergiodj+buildbot@sergiodj.net]

Buildslave:
	marist-fedora-s390x

Full Build URL:
	<http://gdb-build.sergiodj.net/builders/Fedora-s390x-m64/builds/8634>

Commit(s) tested:
	629dabe3b731c6194499652301935f34c3c20e0c

Author(s) (in the same order as the commits):
	Alan Modra <amodra@gmail.com>

Subject:
	Fix hidden visibility compiler test

Testsuite log (gdb.sum and gdb.log) URL(s):
	<http://gdb-build.sergiodj.net/results/Fedora-s390x-m64/62/629dabe3b731c6194499652301935f34c3c20e0c/>

*** Diff to previous build ***
============================
PASS -> FAIL: gdb.threads/gcore-stale-thread.exp: save a corefile
============================


*** Complete list of XFAILs for this builder ***

To obtain the list of XFAIL tests for this builder, go to:

	<https://git.sergiodj.net/gdb-xfails.git/tree/xfails/Fedora-s390x-m64/xfails/master/xfail?id=b916c04>

You can also see a pretty-printed version of the list, with more information
about each XFAIL, by going to:

	<https://git.sergiodj.net/gdb-xfails.git/tree/xfails/Fedora-s390x-m64/xfails/master/xfail.table?id=b916c04>