Don't emit multiple copies of annotations when merging dex files.

This change requires all annotations to be loaded into memory
so they can be sorted. There does not appear to be a required
order to the annotations in .dex files. Loading annotations also
requires loading encoded values, which makes this into a large
refactoring.

Change-Id: Ib7e2656c595018be4e9936eb84a22f1c1de56750
http://b/4090053
21 files changed