[mlir][linalg] Use ub.poison in data layout propagation if a packed operand requires padding. (#159467) In the past, it was hard to set padding values because we did not have ub.poison. It is not always correct if we set zeros as padding values. Now we can use `ub.poison` in this case. The revision adds the support for setting padding value using `ub.poison` when padding is required in the propagation. Otherwise, it creates an invalid pack op. Additionally the revision adds a control option for allowing padding in the pattern which is false by default. To correctly do this, a new `requirePaddingValueStrict` method is added which assumes dynamic dims would mean padding is required. The revision also removes trailing white space in the lit test file. Co-authored-by : Nirvedh Meshram <nirvedh@gmail.com> --------- Signed-off-by: hanhanW <hanhan0912@gmail.com> Signed-off-by: Nirvedh Meshram <nirvedh@gmail.com> Co-authored-by: Nirvedh Meshram <nirvedh@gmail.com>
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