Add option to create a "Bug:" line in commit messages. am: 90784f32d5 am: 82fb78458b am: 81270a4d14

Original change: https://android-review.googlesource.com/c/platform/packages/modules/ArtPrebuilt/+/1594253

MUST ONLY BE SUBMITTED BY AUTOMERGER

Change-Id: Ia8438b346fa5d2121a7a71a16c59a489a086b6a1