[llvm] Adding Matching and Inference Functionality to Propeller (PR #160706)

[Rahman Lavaee via llvm-commits]

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rlavaee wrote:

We don't need to do this. Hash should be defined as optional and set `if(FeatureOrErr->BBHash)`. Then we always push_back `{ID, Offset, Size, Metadata, std::move(CallsiteEndOffsets), Hash}`,

https://github.com/llvm/llvm-project/pull/160706