Add profile support for apps with shared runtime.

- extend ProfileSaver to track different dex locations to different
profile files.
- allow repeated calls to Runtime::RegisterAppInfo() which will
register a new pair <profile_file, locations_to_track> with the profile
saver.

Bug: 26080105
Change-Id: I58c4587d5f462c557411ad7126a00c29cd7db3a6