Uncaught exceptions shouldn't kill the process

Instead, we record the exception, and throw it from all subsequent
tests.

Fix: 404848942
Flag: EXEMPT host test change only
Test: $ANDROID_BUILD_TOP/frameworks/base/ravenwood/scripts/run-ravenwood-tests.sh -s
Test: Manual test with RavenwoodExceptionTest
Change-Id: I62b8478763411cf110ca85026eeb5a2bf746abb5