Adapt a swift/master change to master-next (StringRef vs std::string)
Adapt a swift/master change to master-next (StringRef vs std::string)

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