Since we don't execute any subtests, using igt_exit leads to
inconsistent behaviour. In the future, this may be converted.
Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=73641
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
The purpose of this test is to exercise the userspace latency hogs
reported by Arjan van de Ven. He found some applications blocked the
device by stalling on the GPU inside the pagefault handler.
