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

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

MUST ONLY BE SUBMITTED BY AUTOMERGER

Change-Id: I26a1f32d3d6be45eca376efc0963605c37c18a7d