simpleinline: Pop 'visited' stack when traversing call graph
simpleinline: Pop 'visited' stack when traversing call graph

Summary:
The `visited` set serves to detect recursive calls in the call graph. However
we currently don't pop items off the stack when we backtrack, causing us to
mistakenly mark some callsites as recursive.

Reviewed By: dariorussi

Differential Revision: D3647713

fbshipit-source-id: c4720e9c426342f4203aeedc59a1e3468e57c8c9

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