Add class def idx symbol file
Add class def idx symbol file

Summary:
New symbol file, based on the index in `class_def_item[]`, which art helpfully
caches on the `java.lang.Class` object.

Reviewed By: bertmaher

Differential Revision: D3768869

fbshipit-source-id: 979d8e7465b1cb7927ec01d2ca4b83ea29029198

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