ART: Refactor run-test 482-loop-back-edge-use

The test used to rely on absolute liveness positions of instructions.
This was painful but worked on all architectures because all passes
were platform agnostic. This does not apply any more and the test
needed to be rewritten.

Change-Id: I423e61ba64a9522361f8e20c27b1975656419f67
1 file changed