[mlir][vector] Handle empty `MaskOp` in `LowerVectorMask`, `MaskOpRewritePattern` (#72031)
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
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