Remove the "verification" step in proguard map merging
Remove the "verification" step in proguard map merging

Summary:
Just append to the mapping file instead.

I'm not super clear why, but depending on the flags that PG gets called with,
it may or may not emit an entry for every single class in the APK.

Reviewed By: newobj

Differential Revision: D4359216

fbshipit-source-id: aefe876bdeadad1ae13a988b99004716370aec44

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