[mlir] Reapply "Loosen restrictions on folding dynamic reshapes" (#142827) The original PR https://github.com/llvm/llvm-project/pull/137963 had a nvidia bot failure. This appears to be a flaky test because rerunning the build was successful. This change needs commit 6f2ba47 to fix incorrect usage of `getReassociationIndicesForCollapse`. Reverts llvm/llvm-project#142639 Co-authored-by: Artem Gindinson <gindinson@roofline.ai>
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