[Polly] Remove pipeline-level Oz handling for LoopRotate (#191137) This handling was moved fully into the pass in 1662c200a5b151ad15b7efc82837076d8967dc11. However, that changed missed the usage of LoopRotate in polly. GitOrigin-RevId: 3ad6afe0609b2138b81f773cf4fbe2d464bc26d6