[llvm-ir2vec][MIR2Vec] Supporting MIR mode in triplet and entity generation (#164329) Add support for Machine IR (MIR) triplet and entity generation in llvm-ir2vec. This change extends llvm-ir2vec to support Machine IR (MIR) in addition to LLVM IR, enabling the generation of training data for MIR2Vec embeddings. MIR2Vec provides machine-level code embeddings that capture target-specific instruction semantics, complementing the target-independent IR2Vec embeddings. - Extended llvm-ir2vec to support triplet and entity generation for Machine IR (MIR) - Added `--mode=mir` option to specify MIR mode (vs LLVM IR mode) - Implemented MIR triplet generation with Next and Arg relationships - Added entity mapping generation for MIR vocabulary - Updated documentation to explain MIR-specific features and usage (Partially addresses #162200 ; Tracking issue - #141817)
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