message: [TF:XLA] calls tf.TensorFlowTestCase's setUp/tearDown in the setUp/tearDown
  functions of XLATestCase. This enables the tf Graph to be reset everytime we
  run the tests.
diff: @@ -82,6 +82,7 @@ class XLATestCase(test.TestCase):
  manifest_file.close()
  def setUp(self):
  + super(XLATestCase, self).setUp()
  name = '{}.{}'.format(type(self).__name__, self._testMethodName)
  if self.disabled_regex is not None and self.disabled_regex.match(name):
  logging.info('Disabled test case: %s', name)
  @@ -93,6 +94,7 @@ class XLATestCase(test.TestCase):
  np.random.seed(random_seed.DEFAULT_GRAPH_SEED)
  def tearDown(self):
  + super(XLATestCase, self).tearDown()
  logging.info('End test case: %s', self._testMethodName)
  @contextlib.contextmanager
  