Revert "Revert "Do not load app image for class collisions""

Fixed bug in oat file assistant to allow the special shared library
marker.

Bug: 77342775
Bug: 79200502
Bug: 79575750
Test: test-art-host

This reverts commit 2c7e13b1.

Change-Id: I647f55a07e4aef8bef56fb1ad7ff23056174b135