Allow all GCs when not using read barrier am: 0a63beeb09 am: 53d8068626 am: 27b8fe5390

Original change: https://android-review.googlesource.com/c/platform/art/+/2190029

Change-Id: Ibf68f3421b5e0485981797c1dea479869dbee969
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>