AST: Mark some attributes as ABI/API breaking to add/remove
AST: Mark some attributes as ABI/API breaking to add/remove

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