Merge "Add safety comments." into main am: dcac88ceac am: 383ff05ee9 am: d6ed54622c am: 06e5b34cd5

Original change: https://android-review.googlesource.com/c/platform/system/core/+/2651895

Change-Id: Ic3a2b110233f7bb070045f6d731408108ebebba1
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>