XFAIL this debug-mode test that I just broke. Eric has a patch out for review (D59166) that rewrites this test completely, so I'm not going to bother fixing it.

git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@356211 91177308-0d34-0410-b5e6-96231b3b80d8
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