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

Needed for cts testing of uses-library functionality.

Part of a multi-project change.

Bug: 26880306

(cherry-picked from commit 914e91b46736bfd22cad01e8bd6861528ffc16c3)

Change-Id: I213d1a59a14c03aad41d5dced2f10d31c6d6b4ca
1 file changed