Add code duplication reporting to dex.py
Add code duplication reporting to dex.py

Summary: Add code duplication reporting with the new "--code-duplication" option. This finds all methods that share the exact same code units and reports them all. This could be useful in finding more optimizations or verifying optimizations are working.

Reviewed By: justinjhendrick

Differential Revision: D5320827

fbshipit-source-id: efda03b962d9161efed5988ed7480a3cd025621f

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