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This patch adds handling of an empty `MaskOp` to `MaskOpRewritePattern` and thereby fixes a crash. It also pulls the `MaskOp` canonicalization patterns into `LowerVectorMask` so that empty `MaskOp`s are folded away in the Pass. Fix https://github.com/llvm/llvm-project/issues/71036
Multi-Level Intermediate Representation
See https://mlir.llvm.org/ for more information.