[tests] One last batch of XFAILs, for tests using new symbols added to libc++.

 - As of this commit, the test suite should now fully pass on both darwin11 and
   darwin12 when testing against either a locally built libc++ or the system libc++.

git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@174478 91177308-0d34-0410-b5e6-96231b3b80d8
16 files changed