Fix getSlot optimization for const traits that don't have default values.
Fix getSlot optimization for const traits that don't have default values.

mozilla/shumway,tschneidereit/shumway,mozilla/shumway,mbebenita/shumway,mozilla/shumway,yurydelendik/shumway,yurydelendik/shumway,mbebenita/shumway,mbebenita/shumway,mbebenita/shumway,mozilla/shumway,tschneidereit/shumway,mozilla/shumway,mbebenita/shumway,mozilla/shumway,tschneidereit/shumway,tschneidereit/shumway,yurydelendik/shumway,yurydelendik/shumway,tschneidereit/shumway,mbebenita/shumway,mbebenita/shumway,yurydelendik/shumway,mozilla/shumway,tschneidereit/shumway,tschneidereit/shumway,yurydelendik/shumway,mbebenita/shumway,mozilla/shumway,tschneidereit/shumway,yurydelendik/shumway,yurydelendik/shumway