[AST] Adjust for LLVM r373437
[AST] Adjust for LLVM r373437

Add the new VecOfBitcastsToInt kind to the enum.

atrick/swift,hooman/swift,xwu/swift,jmgc/swift,nathawes/swift,airspeedswift/swift,jckarter/swift,CodaFi/swift,nathawes/swift,apple/swift,gregomni/swift,CodaFi/swift,rudkx/swift,aschwaighofer/swift,JGiola/swift,jckarter/swift,xwu/swift,stephentyrone/swift,jckarter/swift,glessard/swift,CodaFi/swift,jmgc/swift,gregomni/swift,nathawes/swift,atrick/swift,ahoppen/swift,ahoppen/swift,benlangmuir/swift,allevato/swift,rudkx/swift,atrick/swift,CodaFi/swift,rudkx/swift,stephentyrone/swift,aschwaighofer/swift,gregomni/swift,parkera/swift,hooman/swift,aschwaighofer/swift,apple/swift,xwu/swift,parkera/swift,airspeedswift/swift,glessard/swift,jmgc/swift,gregomni/swift,CodaFi/swift,allevato/swift,nathawes/swift,JGiola/swift,nathawes/swift,tkremenek/swift,allevato/swift,harlanhaskins/swift,atrick/swift,roambotics/swift,parkera/swift,ahoppen/swift,roambotics/swift,JGiola/swift,stephentyrone/swift,airspeedswift/swift,roambotics/swift,jmgc/swift,tkremenek/swift,roambotics/swift,hooman/swift,tkremenek/swift,hooman/swift,apple/swift,airspeedswift/swift,benlangmuir/swift,rudkx/swift,glessard/swift,ahoppen/swift,benlangmuir/swift,aschwaighofer/swift,roambotics/swift,hooman/swift,xwu/swift,rudkx/swift,airspeedswift/swift,nathawes/swift,harlanhaskins/swift,jmgc/swift,stephentyrone/swift,hooman/swift,parkera/swift,harlanhaskins/swift,CodaFi/swift,benlangmuir/swift,atrick/swift,apple/swift,stephentyrone/swift,jmgc/swift,jckarter/swift,jckarter/swift,tkremenek/swift,parkera/swift,JGiola/swift,xwu/swift,roambotics/swift,parkera/swift,ahoppen/swift,aschwaighofer/swift,atrick/swift,glessard/swift,JGiola/swift,harlanhaskins/swift,airspeedswift/swift,tkremenek/swift,harlanhaskins/swift,benlangmuir/swift,benlangmuir/swift,CodaFi/swift,nathawes/swift,allevato/swift,gregomni/swift,JGiola/swift,stephentyrone/swift,xwu/swift,tkremenek/swift,allevato/swift,stephentyrone/swift,rudkx/swift,allevato/swift,glessard/swift,parkera/swift,hooman/swift,harlanhaskins/swift,apple/swift,apple/swift,jckarter/swift,gregomni/swift,allevato/swift,jckarter/swift,parkera/swift,ahoppen/swift,tkremenek/swift,xwu/swift,airspeedswift/swift,glessard/swift,aschwaighofer/swift,jmgc/swift,harlanhaskins/swift,aschwaighofer/swift