8038416: Access to undefined scoped variables deoptimized too much Reviewed-by: jlaskey, lagergren

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

8038396: fix for the compiler expression evaluator to be more inquisitive about types Reviewed-by: hannesw, lagergren

8037534: Use scope types to determine optimistic types Reviewed-by: hannesw, lagergren