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lit configurations for MC regression test generation.
As an introduction see: https://medium.com/@mshockwave/using-llvm-lit-out-of-tree-5cddada85a78 ([archived](https://web.archive.org/web/20240421091240/https://medium.com/@mshockwave/using-llvm-lit-out-of-tree-5cddada85a78))
