Util: added support for metamodel and runtime "is" operator using ProducedType
Util: added support for metamodel and runtime "is" operator using ProducedType

jvasileff/ceylon.language,lucaswerkmeister/ceylon.language,ceylon/ceylon.language,unratito/ceylon.language,ceylon/ceylon.language,lucaswerkmeister/ceylon.language,jvasileff/ceylon.language,unratito/ceylon.language