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...to work around error building `unittests/runtime` on Linux. `stdlib/include/llvm/Support` headers, a subset of `llvm-project/llvm/include/llvm/Support`, are not compatible with the latter. Since we favor stdlib headers here, this makes sure Support headers will not be transitively included through gtest, and helps to avoid mixed includes, where a Support header existing only in LLVM is picked from LLVM, whereas a Support header existing in both of the aforementioned directories is picked from our stdlib.