add support for installing distribution jars into jre/lib/ext directory
made use of generated Node classes predicated on value of graal.useGeneratedNodes system property (default is false)
fixed eclipseformat issue
Truffle-DSL: fixed lost source sections for polymorphic specializations. (GRAAL-851 #resolve)
Truffle-DSL: fixed polymorphic to monomorphic transition. It remained polymorphic in some cases.