Include llvm StringMap header where used
Include llvm StringMap header where used

Most likely another header was previously including StringMap.h so
FrontendInputsAndOutputs.h got it transitively.

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