enable libswift in PR tests
enable libswift in PR tests

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