Added visibility needed for the S snapshot am: 1b00dad50e

Original change: https://googleplex-android-review.googlesource.com/c/platform/libcore/+/19321575

Change-Id: Iae6cb1d28a0943892edc375d4c448a47b83cf78a
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>