Fix `ClassLinker::AppendToBootClassPath` usages. am: 28451dc192 am: 678b965707 am: 57bd641786

Original change: https://android-review.googlesource.com/c/platform/art/+/2196996

Change-Id: Ief7908cc9822a4829e795a7c9a62596f883a281f
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>