phosek added a comment. After some more digging through libc++ test suite, I think I understand now why these are different variables. It may be possible to remove these and just rely on plain CMake variables but this is likely going to require some more CMake and lit surgery, so for now I'm going to land https://reviews.llvm.org/D40820 which is an alternative solution and revisit this later after I cleanup libc++ test suite.
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