Fix application moves.

We don't dex2oat during application moves, so we must scan
the package again scanPackageDirtyLI to deduce its ABI.

This is unnecessary (since a move cannot change ABIs), but we
need some additional refactoring to avoid a second scan.

bug: 21337469

Change-Id: I3e9dfd5db1c928847f9d527dc15d29a05ff40e7d