Better branch prediction for markVisible. (transplanted from 5b6c80049d6e6c0df2396099b865729f21200de8)
Better branch prediction for markVisible.
(transplanted from 5b6c80049d6e6c0df2396099b865729f21200de8)

gabeharms/firestorm,gabeharms/firestorm,gabeharms/firestorm,gabeharms/firestorm,gabeharms/firestorm,gabeharms/firestorm,gabeharms/firestorm,gabeharms/firestorm,gabeharms/firestorm