Add support for relative patching to quick offsets.

We now have support for patching relative patches to quick offsets
(interpreter bridge, generic trampoline). This fixes an issue where
the compiler was generating relative branches to methods but then
later deciding to not compile them, we now properly patch these in
the image writer.

Credits: agampe for help.
Bug: 15283931

Change-Id: I3ea5278b39def6c442432fb14103a91c6eae6d0f