Update D8 and R8 to 3.3.20-dev+aosp1 am: 3d7bf6717e am: 50a08d874a

Original change: https://android-review.googlesource.com/c/platform/prebuilts/r8/+/2049608

Change-Id: Id2399a00662a8aca2e567b2a213fb361c2df109d
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>