JDWP: more exception tests

Adds more tests about EXCEPTION event:
- ExceptionCaughtTest: tests caught exception event
- ExceptionUncaughtTest: tests uncaught exception event
- CombinedExceptionEventsTest: tests combined EXCEPTION events

These tests check the reported exception object, throw and catch
locations are correct. They also involve transitions through native
code and interpreter to check we properly compute these locations.

Bug: 19520690
Change-Id: Ifd7293ca397a5096c811d31c79231172579eafc3