AddLLVM is needed for several functions that are used in tests and as such needs to be included from the right context which previously wasn't the case. Differential Revision: https://reviews.llvm.org/D40280 git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@319515 91177308-0d34-0410-b5e6-96231b3b80d8