Finds calls to QObject::tr() with non literal argument.
Example: tr(myStr.toUtf8());
This usage of tr() might be incorrect because lupdate won't be able to pick up the strings for translation.
If the possible values have been marked with QT_TR_NOOP or QT_TRANSLATE_NOOP,
then this usage of tr() is actually fine, i.e. the clazy warning is a false-positive in that case.