[llvm] Adding Matching and Inference Functionality to Propeller-PR4: Implement matching and inference and create clusters (PR #167622)

[Rahman Lavaee via llvm-commits]

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+; BB cluster section tests when using edges profile and basic block hashes to generate clusters.
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rlavaee wrote:

Not sure if I understand the role of hashes in this test. It looks like we're feeding in the same source except with a different layout. Please also explain in the comments.

https://github.com/llvm/llvm-project/pull/167622