[mlir] Fix bug in UnPackOp tiling implementation causing infinite loop (#113571) This fixes a bug in the tiling implementation of tensor.unpack that was causing an infinite loop when certain unpack ops get tiled and fused as a producer. The tiled implementation of tensor.unpack sometimes needs to create an additional tensor.extract_slice on the result of the tiled unpack op, but this slice was getting added to the `generatedSlices` of the tiling result. The `generatedSlices` are used to find the next producers to fuse, so it caused an infinite loop of fusing the same unpack op after it was already in the loop. This fixes the bug by adding the slice of the source instead of the result. Signed-off-by: Max Dawkins <max.dawkins@gmail.com>
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