[clang-tools-extra] [llvm] [MLGO] Upstream the corpus extraction tooling (PR #72319)

[Aiden Grossman via cfe-commits]

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+# Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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boomanaiden154 wrote:

Looks like all the other Python tests within the monorepo are pretty much lit tests. I'll work on converting these tests to lit tests later today. Should be feasible since we're essentially just using Python tooling to validate where files are, which we can easily do in lit.

https://github.com/llvm/llvm-project/pull/72319