As detailed in PR testsuite/34534, a test FAILs on Solaris when using
the native ld:

FAIL: gdb.base/break-on-linker-gcd-function.exp: break on line in garbage collected function
FAIL: gdb.base/break-on-linker-gcd-function.exp: readnow: break on line in garbage collected function

Even though ld supports --gc-sections as an alias for the native -z
discard-unused=sections, this doesn't work in this particular case.
While the issue is under investigation, this patch xfail's the test when
Solaris ld is in use.

Bug: https://sourceware.org/bugzilla/show_bug.cgi?id=34534

Ok for trunk?

	Rainer

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Rainer Orth, Center for Biotechnology, Bielefeld University