Revert "Disable write-barrier elimination pass" am: 7c1dd6e2d1 am: b02136c3ef

Original change: https://android-review.googlesource.com/c/platform/art/+/2865535

Change-Id: I34b2aabbec2f8a78c1b6b60643dc7251171b98da
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>