879f8616ef
This PR introduces the initial infrastructure and vocabulary necessary for generating embeddings for MIR (discussed briefly in the earlier IR2Vec RFC - https://discourse.llvm.org/t/rfc-enhancing-mlgo-inlining-with-ir2vec-embeddings). The MIR2Vec embeddings are useful in driving target specific optimizations that work on MIR like register allocation. (Tracking issue - #141817)