AST: Clean up lint from Swift 3 removal
AST: Clean up lint from Swift 3 removal

There was some dead code that's no longer needed.

airspeedswift/swift,gregomni/swift,alblue/swift,shajrawi/swift,jckarter/swift,stephentyrone/swift,lorentey/swift,tkremenek/swift,harlanhaskins/swift,brentdax/swift,jckarter/swift,lorentey/swift,natecook1000/swift,tkremenek/swift,sschiau/swift,sschiau/swift,jopamer/swift,practicalswift/swift,atrick/swift,alblue/swift,jckarter/swift,brentdax/swift,devincoughlin/swift,roambotics/swift,practicalswift/swift,natecook1000/swift,shajrawi/swift,parkera/swift,airspeedswift/swift,CodaFi/swift,benlangmuir/swift,natecook1000/swift,lorentey/swift,gregomni/swift,rudkx/swift,CodaFi/swift,gribozavr/swift,stephentyrone/swift,tkremenek/swift,shajrawi/swift,benlangmuir/swift,roambotics/swift,rudkx/swift,lorentey/swift,xedin/swift,rudkx/swift,hooman/swift,airspeedswift/swift,atrick/swift,xedin/swift,harlanhaskins/swift,amraboelela/swift,shahmishal/swift,apple/swift,xwu/swift,parkera/swift,aschwaighofer/swift,stephentyrone/swift,amraboelela/swift,jopamer/swift,alblue/swift,apple/swift,devincoughlin/swift,austinzheng/swift,jmgc/swift,allevato/swift,airspeedswift/swift,sschiau/swift,tkremenek/swift,gribozavr/swift,glessard/swift,aschwaighofer/swift,practicalswift/swift,benlangmuir/swift,parkera/swift,JGiola/swift,jckarter/swift,shajrawi/swift,xedin/swift,nathawes/swift,karwa/swift,JGiola/swift,jmgc/swift,natecook1000/swift,harlanhaskins/swift,allevato/swift,ahoppen/swift,glessard/swift,amraboelela/swift,gribozavr/swift,allevato/swift,aschwaighofer/swift,CodaFi/swift,amraboelela/swift,austinzheng/swift,ahoppen/swift,roambotics/swift,jopamer/swift,sschiau/swift,jopamer/swift,danielmartin/swift,benlangmuir/swift,shajrawi/swift,karwa/swift,apple/swift,jopamer/swift,brentdax/swift,austinzheng/swift,glessard/swift,JGiola/swift,parkera/swift,natecook1000/swift,karwa/swift,hooman/swift,stephentyrone/swift,gregomni/swift,practicalswift/swift,brentdax/swift,CodaFi/swift,JGiola/swift,nathawes/swift,shahmishal/swift,austinzheng/swift,amraboelela/swift,nathawes/swift,devincoughlin/swift,austinzheng/swift,jmgc/swift,karwa/swift,aschwaighofer/swift,shahmishal/swift,danielmartin/swift,rudkx/swift,parkera/swift,gribozavr/swift,gregomni/swift,sschiau/swift,danielmartin/swift,jckarter/swift,lorentey/swift,gregomni/swift,shahmishal/swift,tkremenek/swift,apple/swift,jopamer/swift,allevato/swift,CodaFi/swift,gribozavr/swift,nathawes/swift,airspeedswift/swift,xedin/swift,karwa/swift,hooman/swift,shahmishal/swift,shahmishal/swift,nathawes/swift,stephentyrone/swift,devincoughlin/swift,roambotics/swift,stephentyrone/swift,danielmartin/swift,benlangmuir/swift,sschiau/swift,gregomni/swift,xwu/swift,xwu/swift,brentdax/swift,CodaFi/swift,allevato/swift,glessard/swift,natecook1000/swift,harlanhaskins/swift,xedin/swift,airspeedswift/swift,jopamer/swift,apple/swift,shajrawi/swift,karwa/swift,amraboelela/swift,hooman/swift,ahoppen/swift,aschwaighofer/swift,xwu/swift,parkera/swift,lorentey/swift,benlangmuir/swift,amraboelela/swift,xwu/swift,ahoppen/swift,natecook1000/swift,stephentyrone/swift,harlanhaskins/swift,practicalswift/swift,glessard/swift,ahoppen/swift,shahmishal/swift,JGiola/swift,atrick/swift,karwa/swift,nathawes/swift,practicalswift/swift,rudkx/swift,devincoughlin/swift,atrick/swift,atrick/swift,alblue/swift,karwa/swift,aschwaighofer/swift,harlanhaskins/swift,shahmishal/swift,brentdax/swift,airspeedswift/swift,parkera/swift,roambotics/swift,danielmartin/swift,alblue/swift,aschwaighofer/swift,gribozavr/swift,lorentey/swift,glessard/swift,danielmartin/swift,jmgc/swift,jmgc/swift,devincoughlin/swift,hooman/swift,xwu/swift,tkremenek/swift,xwu/swift,hooman/swift,ahoppen/swift,austinzheng/swift,sschiau/swift,allevato/swift,hooman/swift,xedin/swift,xedin/swift,harlanhaskins/swift,alblue/swift,parkera/swift,gribozavr/swift,JGiola/swift,CodaFi/swift,sschiau/swift,shajrawi/swift,jckarter/swift,danielmartin/swift,alblue/swift,gribozavr/swift,jckarter/swift,devincoughlin/swift,atrick/swift,devincoughlin/swift,allevato/swift,practicalswift/swift,nathawes/swift,apple/swift,shajrawi/swift,practicalswift/swift,brentdax/swift,lorentey/swift,tkremenek/swift,xedin/swift,roambotics/swift,jmgc/swift,austinzheng/swift,jmgc/swift,rudkx/swift