message: Xfail two tests that showed expressions that generate bad code.
  <rdar://problem/31515121>
diff: @@ -35,6 +35,9 @@ class TestUnitTests(TestBase):
  @decorators.expectedFailureAll(
  oslist=["linux"],
  bugnumber="rdar://28180489")
  + @decorators.expectedFailureAll(
  + oslist=["macosx"],
  + bugnumber="rdar://31515121")
  def test_equality_operators_fileprivate(self):
  """Test that we resolve expression operators correctly"""
  self.buildAll()
  @@ -43,6 +46,9 @@ class TestUnitTests(TestBase):
  @decorators.expectedFailureAll(
  oslist=["linux"],
  bugnumber="rdar://28180489")
  + @decorators.expectedFailureAll(
  + oslist=["macosx"],
  + bugnumber="rdar://31515121")
  def test_equality_operators_private(self):
  """Test that we resolve expression operators correctly"""
  self.buildAll()
  @@ -110,7 +116,7 @@ class TestUnitTests(TestBase):
  # And make sure we got did increment the counter by the right value.
  value = self.frame.EvaluateExpression("Fooey.GetCounter()", options)
  - self.assertTrue(value.GetError().Success(), "GetCounter worked")
  + self.assertTrue(value.GetError().Success(), "GetCounter failed with error %s"%(value.GetError().GetCString()))
  counter = value.GetValueAsUnsigned()
  self.assertTrue(
  