Comment from [~thartmann]:
"Similar to JDK-8353638, wouldn't it make sense to now make the behavior of StressCompiledExceptionHandlers the default to avoid deopts on async exceptions? I.e., get rid of [code in JavaThread::handle_async_exception] and potentially add another stress flag that triggers deopt"

Since this is the last use of StressCompiledExceptionHandlers, we would also be able to remove the flag completely.