message: [tests, libstdcxx] Add missing test category on the TestDataFormatterStdUniquePtr tests
  Each test needs to be marked with the add_test_categories decorator individually.
diff: @@ -66,6 +66,7 @@ class StdUniquePtrDataFormatterTestCase(TestBase):
  @skipIfWindows # libstdcpp not ported to Windows
  @skipIfDarwin # doesn't compile on Darwin
  @skipIfwatchOS # libstdcpp not ported to watchos
  + @add_test_categories(["libstdcxx"])
  def test_recursive_unique_ptr(self):
  # Tests that LLDB can handle when we have a loop in the unique_ptr
  # reference chain and that it correctly handles the different options
  