Use a different name for the product classloader namespace. am: c55265c083 am: a9e0172647 am: 025953d771 am: 9e6c799a4b

Original change: https://android-review.googlesource.com/c/platform/art/+/2166783

Change-Id: I887733b1a1d973e8837fa5adaac6bc2a8b6b90fc
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>