remove unneccesary second interdex run
remove unneccesary second interdex run

Summary: We used to do something different if we detected that interdex grew the number of dexes. So it made sense to do a second attemp. Since we no longer do that, remove the second call since it would just return the same result regardless.

Reviewed By: bertmaher

Differential Revision: D3589709

fbshipit-source-id: 7d63ed4112f715cce326c9049943f02f5d7bc169

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