message: Update Fix-It test to rely on a Fix-It that isn't going away.
  The auto-insertion of '!' is going away with
  rdar://problem/42081852. Switch to a different Fix-It (the removal of
  an extraneous '!') instead.
diff: @@ -68,7 +68,7 @@ class TestSwiftFixIts(TestBase):
  # First make sure the expression fails with no fixits:
  value = frame.EvaluateExpression(
  - "var $tmp : Int = does_have.could_be", options)
  + "var $tmp : Int = does_have.could_be!!", options)
  self.assertTrue(value.GetError().Fail())
  self.assertTrue(
  value.GetError().GetError() != 0x1001,
  @@ -77,7 +77,7 @@ class TestSwiftFixIts(TestBase):
  # Now turn on auto apply:
  options.SetAutoApplyFixIts(True)
  value = frame.EvaluateExpression(
  - "var $tmp : Int = does_have.could_be", options)
  + "var $tmp : Int = does_have.could_be!!", options)
  self.assertTrue(value.GetError().Fail(),
  "There's no result so this is counted a fail.")
  self.assertTrue(
  