[MLIR][AArch64] Refactor lowering of vector.contract to Neon I8MM#149810

momchil-velikov merged 2 commits intomainllvm/llvm-project:mainfrom

users/momchil-velikov/vector-contract-i8mm-refactorllvm/llvm-project:users/momchil-velikov/vector-contract-i8mm-refactorCopy head branch name to clipboard