This provides optional lit-based test execution for the LLVM Libc tests, alongside the existing CMake-based test execution. Usage: ninja -C build check-libc-lit cd build && bin/llvm-lit libc/test/src/ Partially addresses [#118694](https://github.com/llvm/llvm-project/issues/118694). A future PR once this lands will flip the default (per suggestion in the RFC)
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