ART: Refactor run-test 904

Refactor run-test so it does not depend on printf output. That way
we can run it in CTS.

Bug: 32072923
Test: art/test/testrunner/testrunner.py -b --host -t 904
Change-Id: Ia0d2e01dba4f46b81e78c88d9c50aafbc69f679e