Summary: Idea's straightforward - any model info we get from stubs is through an explicit model. There's no reason to analyze them except for NamedTuples, which are pre-processed by Pyre into real defines. This is especially pertinent for large toplevels.

Reviewed By: dkgi

Differential Revision: D20567521

fbshipit-source-id: 776a4594534bfc4a9412934cc51bb5aa82ff40dc