GROOVY-6186, GROOVY-6096 : force cast exception for null assignment to int
GROOVY-6334: ensure constructor default parameters are checked
GROOVY-6455: remove generics information to fix static compilation
GROOVY-6464: antlib.xml is missing from jars

moved resources directoryy to the default gradle resource directory location, so that antlib.xml is included in the jar
GROOVY-6469: NumberNumber specialized call site classes always fall back to slow path