Kevin Gozali 54a6e1ad38 Surface: fixed up surface stage value check
Summary: Some logic to check for surface stage should've done bitwise `&` operation instead of equality check, because we do bitwise `|` whenever we "set stage".

Reviewed By: shergin

Differential Revision: D13459156

fbshipit-source-id: 94e2f5279fb1a31060beb7d6195953b25ce603c9
2018-12-13 16:52:30 -08:00
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