Fix potential dex index overflow in dx

Revert change to dex rotation algorithm made as part of commit:
845d9d0eed0f6556e11ee7f7204fda9c8dd41154

Bug: https://code.google.com/p/android/issues/detail?id=161887
Signed-off-by: Peter Jensen <jensenp@google.com>

(cherry picked from commit d024c06726c7e119ee76395611aa7cfe3b0a8b7e)

Change-Id: Iede742620854cef3542bf98b77e66aa8a305195e
2 files changed