6f2ba4712f
Changes `findCollapsingReassociation` to return nullopt in all cases where source shape has `>=2` dynamic dims. `expand(collapse)` can reshape to in any valid output shape but a collapse can only collapse contiguous dimensions. When there are `>=2` dynamic dimensions it is impossible to determine if it can be simplified to a collapse or if it is preforming a more advanced reassociation. This problem was uncovered by https://github.com/llvm/llvm-project/pull/137963 --------- Signed-off-by: Ian Wood <ianwood2024@u.northwestern.edu>