message: Remove cloned prepare_tf pass description from unroll_batch_matmul pass
  Instead, there is already a class level documentation for the pass.
diff: @@ -13,22 +13,6 @@ See the License for the specific language governing permissions and
  limitations under the License.
  ==============================================================================*/
  -// This transformation pass prepares for legalization to the TFLite dialect by
  -// converting operations in TensorFlow dialect into operations that can be
  -// legalized to TensorFlow Lite dialect with simple replacements. The newly
  -// created operations are in the TensorFlow dialect if the operation can be
  -// represented using a TensorFlow op. Otherwise, TensorFlow Lite dialect op is
  -// used. For example, Conv2D in TFLite which uses OHWI data format for filters
  -// is not supported in TensorFlow because TensorFlow requires filters in the
  -// HWIO data format.
  -//
  -// Motivation to prepare for the TFLite legalization before the actual
  -// legalization is to exploit constant folding opportunities in any newly
  -// created ops by leveraging constant folding support for the TensorFlow ops.
  -// This way TFLite can be used as a serialization format only and does not
  -// require access to the TFLite runtime for optimizations as required by the
  -// TFLite team.
  -
  #include "tensorflow/compiler/mlir/lite/transforms/unroll_batch_matmul.h"
  #include <climits>
  