Do not depend on the standard library on the system. Replace the #include with
the relevant section of libcxx.

As an aside, I am not at all confident that this test is still testing that it's
supposed to.


git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@138075 91177308-0d34-0410-b5e6-96231b3b80d8
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