Add ability to see if a dex file is backed by an oat file.

Native support for new DexFile.isBackedByOatFile.

Part of a multi-project change.

Bug: 26880306

(cherry-picked from commit 93a66cc779898d46c620e5d9c8bc71e2a71f6610)

Change-Id: I15e8ec44a216b13e494affd2fd3ff5f66fa79597
1 file changed