Allow all GCs when not using read barrier am: 0a63beeb09 am: 53d8068626 am: 27b8fe5390 am: 39758ed65c

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

Change-Id: I1bde3c4861428b4f0c19640b00b64ff685b8c336
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>