Merge "Add safety comments." into main am: 406d43397c

Original change: https://android-review.googlesource.com/c/platform/system/core/+/2672075

Change-Id: Ib0b8e92f2d1d2d39b4836b56281a60d2e46ef377
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>