Enhance 160-read-barrier-stress test for corner cases of CMC compaction

This covers the corner case of reference update logic when using MOVE
ioctl to perform CMC compaction.

Flag: EXEMPT adding test
Bug: 343220989
Test: art/test/testrunner/testrunner.py -t 160-read-barrier-stress
Change-Id: I543e9a44cd3d817611cd6421b8243b758f52dfa8
6 files changed