[MLIR][Canonicalization] Add shape_cast folding patterns (#183061) ### Summary This PR adds two shape_cast-related canonicalization patterns for `vector.to_elements` and `vector.from_elements`. ### Details - Added` ToElements(ShapeCast(X)) -> ToElements(X)` as an in-place fold in `ToElementsOp::fold`. - Added `ShapeCast(FromElements(X)) -> FromElements(X)` as an `OpRewritePattern` — it must be a pattern (not a `fold`) because we have to create new op `FromElementsOp` with updated result type. This cannot be done with a `fold`, because `fold` cannot create new ops and the existing `FromElementsOp` result type differs from the `ShapeCastOp` result type. Mutating the `FromElementsOp` (not root op) would violate the `fold` contract and break other users. - Added lit tests for the both ops (new `vector-to-elements.mlir`, `vector-from-elements.mlir`) --------- Signed-off-by: Alexandra Sidorova <asidorov@amd.com>
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