message: Include tf_ops.h in legalize_tf.cc
  This file implements legalization from TF ops to XLA ops so
  it should include the header file for TF ops.
diff: @@ -20,6 +20,7 @@ limitations under the License.
  #include "mlir/IR/PatternMatch.h" // TF:local_config_mlir
  #include "mlir/Pass/Pass.h" // TF:local_config_mlir
  #include "mlir/StandardOps/Ops.h" // TF:local_config_mlir
  +#include "tensorflow/compiler/mlir/tensorflow/ir/tf_ops.h"
  #include "tensorflow/compiler/mlir/xla/ir/xla_ops.h"
  #include "tensorflow/compiler/mlir/xla/transforms/passes.h"
  