ART: Add correct field index to reference visiting

Use the created infrastructure to report references with the right
field indices.

Bug: 31385354
Test: m test-art-host-run-test-906-iterate-heap
Test: m test-art-host-run-test-913-heaps
Change-Id: I4647ea1bfe83dbce80c2fcb13ed1658527921f14
2 files changed