Fix `ClassLinker::AppendToBootClassPath` usages. am: 28451dc192 am: 678b965707 am: 57bd641786 am: 11ab1be010

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

Change-Id: I15f988703091871135cecc18efc90dc035bee0b1
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>