Rewrite OatFileManager::OpenDexFilesFromOat.

- Remove obsolete option -Xno-dex-file-fallback
- Only load an oat file when class loader context matches.
- Remove obsolete duplicate class check code.

Bug: 132357300
Bug: 156250899
Change-Id: I78e645806e0de2f35ce2614285f1a7cbc705484c
27 files changed