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This PR introduces IR2Vec as an analysis pass. The changes include: - Logic for generating Symbolic encodings. - 75D learned vocabulary. - lit tests. Here is the link to the RFC - https://discourse.llvm.org/t/rfc-enhancing-mlgo-inlining-with-ir2vec-embeddings Acknowledgements: contributors - https://github.com/IITH-Compilers/IR2Vec/graphs/contributors --------- Co-authored-by: svkeerthy <venkatakeerthy@google.com> Co-authored-by: Mircea Trofin <mtrofin@google.com>