Revert "ART: Skip image visitor in OatWriter for VerifyAtRuntime"

This reverts commit d5ce6a80.

This has an unexpected side effect of not correctly including
reference classes in the boot image. Needs more investigation.

Bug: 24103765
Bug: 24213543
Change-Id: I2a7649f07ec73c59a8cb543f12b6496ac74f7a11