message: Simplify graphdef2mlir/graph-default-attr.pbtxt to be more targeted
  This test is intended to check that default attributes are added when missing
  from the GraphDef, the CHECK lines are updated to reflect this.
diff: # RUN: tf-mlir-translate -graphdef-to-mlir %s -o - | FileCheck %s
  -# CHECK: %3:2 = "_tf.Conv2D"(%2#0, %1#0) {T = "tfdtype$DT_FLOAT", data_format = "NHWC", device = "", dilations = [1, 1, 1, 1], explicit_paddings = [], name = "MobilenetV1/MobilenetV1/Conv2d_0/Conv2D", padding = "SAME", strides = [1, 2, 2, 1], use_cudnn_on_gpu = true}
  -# CHECK-NEXT: %4:2 = "_tf.MaxPool"(%3#0) {T = "tfdtype$DT_FLOAT", data_format = "NHWC", device = "", ksize = [1, 2, 2, 1], name = "MaxPool", padding = "SAME", strides = [1, 2, 2, 1]}
  +# Verify that the data_format attributes is pulled from the default value in the
  +# registry when not present in the GraphDef
  +# CHECK: tf.Conv2D
  +# CHECK-SAME: data_format = "NHWC"
  +
  +# Verify that we can also pull some attributes that are needed to be able to
  +# create a Graph in memory, like `T`.
  +# CHECK: tf.MaxPool
  +# CHECK-SAME: T = "tfdtype$DT_FLOAT"
  +
  node {
  name: "input"
  op: "Placeholder"
  