* Do not reset unhandled exception hook
* Add processUnhandledException to perform default unhandled exception
processing
* Add terminateWithUnhandledException to report the unhandled exception
and terminate the program
* Use the default unhandled exception processing in entrypoint, interop
boundaries and in Worker.executeAfter
* Add -Xworker-exception-handling to control exception processing of
Worker.executeAfter. By default its the old behaviour with the old MM,
and new behaviour with the new MM.
Alexander Shabalin