Move to release CAS for updating object fields

Relaxed cas is not sufficient to make sure threads that read the
field will see the copied contents of objects.

Bug: 37187694
Bug: 62240510

Test: test-art-host

(cherry picked from commit a1f20c3f)

Change-Id: I8bff8a67c2c52eb131714b52e6d842c8c08dd70a