RedHatTransformer: use operator instead of hardcoded string
RedHatTransformer: use operator instead of hardcoded string

Use the Operation.operator attribute instead of a hardcoded "++"/"--"
string. Who knows, it might change in the future!

(Well, _these_ probably won’t ever change. And I definitely don’t have
any plans to change the text of other tokens in the future… ahem. Oh,
look, over there! A distraction!)

ceylon/ceylon.ast