[IRGen] Adjust to upstream LLVM change
[IRGen] Adjust to upstream LLVM change

GlobalValue::getAlignment() was removed in a2caa3b61497b6be8c8b77823d0fd62b4be1f177.

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