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

[Mircea Trofin via cfe-commits]

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+# MLGO Python Library
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+This folder contains the MLGO python library. This library consists of telling
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mtrofin wrote:

I wouldn't call it "the" MLGO python library, rather it's utilities for MLGO. Also please read the rest of the para (esp. first line)



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