[mlir][Linalg] Fix linalg.generic iteration domain collapse for dynamic dims (#118208) This pr fixes how iteration domain of linalg.generic is collapsed when fusing with tensor.expand_shape. Previously, the output_shape for tensor.expand shape was infered, which doesn't always work except some special cases. This patch makes the logic explicitly set the bounds of the new collapsed iteration domain, because we already know them. --------- Co-authored-by: Jakub Kuderski <kubakuderski@gmail.com>
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