message: Add test cases for int64 support of `tf.reduce_max` on GPU
  This commit is part of the effort to support int64 for
  `tf.reduce_max` on GPU.
diff: @@ -644,6 +644,20 @@ class MaxReductionTest(test.TestCase):
  np_arr = np.array([special_value_x, special_value_y]).astype(dtype)
  self._compareAll(np_arr, None)
  + def testInt64Reduce3D(self):
  + # Create a 3D array of int64s and reduce across all possible
  + # dimensions
  + np_arr = np.arange(-31, -1).reshape([2, 3, 5]).astype(np.int64)
  + self._compareAll(np_arr, None)
  + self._compareAll(np_arr, [])
  + self._compareAll(np_arr, [0])
  + self._compareAll(np_arr, [1])
  + self._compareAll(np_arr, [2])
  + self._compareAll(np_arr, [0, 1])
  + self._compareAll(np_arr, [1, 2])
  + self._compareAll(np_arr, [0, 2])
  + self._compareAll(np_arr, [0, 1, 2])
  +
  def testFloatReduce3D(self):
  # Create a 3D array of floats and reduce across all possible
  # dimensions
  