8044638: Tidy up Nashorn codebase for code standards
Reviewed-by: lagergren, sundar

8019811: Static calls - self referential functions needed a return type conversion if they were specialized, as they can't use the same mechanism as indy calls
Reviewed-by: sundar, jlaskey

8016667: Wrong bytecode when testing/setting due to null check shortcut checking against primitive too
Reviewed-by: jlaskey, sundar