8166298: 3 nashorn ant tests fail with latest jdk9-dev tip
Reviewed-by: hannesw, mhaupt

8142968: Module System implementation
Summary: Initial integration of JEP 200, JEP 260, JEP 261, and JEP 282
Reviewed-by: mhaupt, hannesw
Contributed-by: alan.bateman@oracle.com, alex.buckley@oracle.com, jonathan.gibbons@oracle.com, karen.kinnear@oracle.com, mandy.chung@oracle.com, mark.reinhold@oracle.com, sundararajan.athijegannathan@oracle.com, erik.joelsson@oracle.com

8044786: Some tests fail with non-optimistic compilation
Reviewed-by: hannesw, jlaskey

8044502: Get rid of global optimistic flag
Reviewed-by: lagergren, sundar

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

Merge

8038398: OptimisticRecompilationTest fails on staging repo nashorn/jdk9/nashorn due to test framework
Reviewed-by: attila, lagergren