Write classes in runtime-generated app image. am: df68c0a6f0 am: 9ff3b10a03 am: e9e9ebcb73

Original change: https://android-review.googlesource.com/c/platform/art/+/2373830

Change-Id: I77abe7a6c3689e7e2a3a7e594a84650b488db223
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>