message: Add regions to invalid graph test to avoid failure after MLIR update
  The verification for the number of regions has been moved earlier, meaning that we now to need to populate the correct number of regions when testing invalid behavior.
diff: @@ -7,7 +7,7 @@ func @invalid_type() -> !tf_executor.foobar
  // Check that tf_executor.graph does not accept any operand.
  func @graph_with_invalid_op(%arg0: tensor<*xf32>) {
  - "tf_executor.graph" (%arg0) : (tensor<*xf32>) -> ()
  + "tf_executor.graph" (%arg0) ({}) : (tensor<*xf32>) -> ()
  // expected-error@-1 {{'tf_executor.graph' op requires zero operands}}
  return
  }
  