SILParser: Remove some dead code
SILParser: Remove some dead code

apple/swift,jmgc/swift,glessard/swift,hooman/swift,glessard/swift,hooman/swift,xwu/swift,ahoppen/swift,nathawes/swift,gregomni/swift,xwu/swift,hooman/swift,rudkx/swift,hooman/swift,parkera/swift,benlangmuir/swift,parkera/swift,jmgc/swift,tkremenek/swift,xwu/swift,rudkx/swift,JGiola/swift,xwu/swift,rudkx/swift,xwu/swift,tkremenek/swift,ahoppen/swift,benlangmuir/swift,glessard/swift,hooman/swift,nathawes/swift,ahoppen/swift,JGiola/swift,tkremenek/swift,parkera/swift,JGiola/swift,nathawes/swift,apple/swift,roambotics/swift,gregomni/swift,apple/swift,atrick/swift,tkremenek/swift,parkera/swift,gregomni/swift,nathawes/swift,atrick/swift,xwu/swift,benlangmuir/swift,glessard/swift,gregomni/swift,jmgc/swift,roambotics/swift,ahoppen/swift,atrick/swift,nathawes/swift,tkremenek/swift,roambotics/swift,parkera/swift,gregomni/swift,atrick/swift,benlangmuir/swift,tkremenek/swift,roambotics/swift,rudkx/swift,tkremenek/swift,xwu/swift,parkera/swift,jmgc/swift,rudkx/swift,jmgc/swift,apple/swift,JGiola/swift,benlangmuir/swift,parkera/swift,apple/swift,hooman/swift,nathawes/swift,JGiola/swift,nathawes/swift,jmgc/swift,glessard/swift,gregomni/swift,roambotics/swift,glessard/swift,atrick/swift,hooman/swift,apple/swift,jmgc/swift,parkera/swift,atrick/swift,benlangmuir/swift,roambotics/swift,ahoppen/swift,rudkx/swift,ahoppen/swift,JGiola/swift