message: Simplify graphdef2mlir/graph-device-retval.pbtxt test to be more targeted
  This tests intend to verify that kDeviceRetOp (triggered by
  tf.experimental_ints_on_device) is properly handled on import and matched to a
  return operation. This updates the CHECK lines to reflect this.
diff: @@ -74,6 +74,9 @@ library {
  }
  # The attribute "experimental_ints_on_device" and the return type INT32
  # ensure that kDeviceRetOp is used instead of kRetOp
  + # CHECK-LABEL: func @foo
  + # CHECK: tf.experimental_ints_on_device = true
  + # CHECK: return %{{.*}} tensor<i32>
  attr {
  key: "experimental_ints_on_device"
  value {
  @@ -87,13 +90,3 @@ versions {
  min_consumer: 12
  }
  -# CHECK: func @main() {
  -# CHECK-NEXT: %0:2 = "_tf.PartitionedCall"() {Tin = [], Tout = ["tfdtype$DT_INT32"], config = "", config_proto = "", device = "", executor_type = "", f = @foo0, name = "PartitionedCall"} : () -> (tensor<*xi32>, !_tf.control)
  -# CHECK-NEXT: return
  -# CHECK-NEXT: }
  -# CHECK: func @foo0() -> tensor<i32>
  -# CHECK-NEXT: attributes {tf.experimental_ints_on_device = true} {
  -# CHECK-NEXT: %0:2 = "_tf.Const"() {device = "", dtype = "tfdtype$DT_INT32", name = "Const", value = dense<5> : tensor<i32>} : () -> (tensor<i32>, !_tf.control)
  -# CHECK-NEXT: %1:2 = "_tf.Identity"(%0#0) {T = "tfdtype$DT_INT32", device = "", name = "Identity"} : (tensor<i32>) -> (tensor<i32>, !_tf.control)
  -# CHECK-NEXT: return %1#0 : tensor<i32>
  -# CHECK-NEXT: }
  