Fix broken testcase: ignore LLDB output that warns about more elements than can be displayed.
- test could be re-written at some point, but right now just trying to clean up known failures for the linux buildbot.



git-svn-id: https://llvm.org/svn/llvm-project/lldb/trunk@175114 91177308-0d34-0410-b5e6-96231b3b80d8