[MLIR][LLVM]: Add an IR utility to perform slice walking (#103053) This commit introduces a slicing utility that can be used to walk arbitrary IR slices. It additionally ships logic to determine control flow predecessors, which allows users to walk backward slices without dealing with both `RegionBranchOpInterface` and `BranchOpInterface`. This utility is used to improve the `noalias` propagation in the LLVM dialect's inliner interface. Before this change, it broke down as soon as pointer were passed through region control flow operations.
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