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a6e72f9392
Currently, the lowering for vector.step lives under a folder. This is not ideal if we want to do transformation on it and defer the materizaliztion of the constants much later. This commits adds a rewrite pattern that could be used by using `transform.structured.vectorize_children_and_apply_patterns` transform dialect operation. Moreover, the rewriter of vector.step is also now used in -convert-vector-to-llvm pass where it handles scalable and non-scalable types as LLVM expects it. As a consequence of removing the vector.step lowering as its folder, linalg vectorization will keep vector.step intact.