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

8040655: When processing a RewriteException debug object, the return value has already been reset to null. We need to catch this value before that.
Reviewed-by: attila, lagergren
Contributed-by: matherey.nunez@oracle.com

8038406: Testability: as a first step of moving loggers away from the process global space, the Debug object now supports logging POJOs from log entries as an event queue, which can be introspected from test scripts. This is way better than screen scraping brittle and subject-to-change log output.
Reviewed-by: attila, hannesw, sundar