[test] Ignore failure for now for Darwin.
[test] Ignore failure for now for Darwin.

This is only a step to clean the buildbot.

git-svn-id: f6089bf0e6284f307027cef4f64114ee9ebb0424@192368 91177308-0d34-0410-b5e6-96231b3b80d8

llvm-mirror/lld,llvm-mirror/lld