[NFC][StringExtras] Use llvm::StringSwitch in canBeArgumentLabel as with canBeMemberName
[NFC][StringExtras] Use llvm::StringSwitch in canBeArgumentLabel as with canBeMemberName

glessard/swift,xedin/swift,lorentey/swift,alblue/swift,xedin/swift,brentdax/swift,xedin/swift,airspeedswift/swift,danielmartin/swift,sschiau/swift,benlangmuir/swift,shajrawi/swift,stephentyrone/swift,alblue/swift,danielmartin/swift,jckarter/swift,karwa/swift,harlanhaskins/swift,shahmishal/swift,rudkx/swift,austinzheng/swift,stephentyrone/swift,huonw/swift,gregomni/swift,practicalswift/swift,brentdax/swift,gribozavr/swift,nathawes/swift,ahoppen/swift,practicalswift/swift,amraboelela/swift,danielmartin/swift,xwu/swift,gribozavr/swift,jmgc/swift,sschiau/swift,natecook1000/swift,gregomni/swift,lorentey/swift,shahmishal/swift,natecook1000/swift,ahoppen/swift,gribozavr/swift,amraboelela/swift,hooman/swift,alblue/swift,rudkx/swift,xwu/swift,austinzheng/swift,jopamer/swift,nathawes/swift,huonw/swift,devincoughlin/swift,glessard/swift,parkera/swift,apple/swift,parkera/swift,allevato/swift,airspeedswift/swift,sschiau/swift,jckarter/swift,CodaFi/swift,karwa/swift,apple/swift,ahoppen/swift,benlangmuir/swift,tjw/swift,shahmishal/swift,huonw/swift,sschiau/swift,jckarter/swift,jmgc/swift,karwa/swift,airspeedswift/swift,amraboelela/swift,nathawes/swift,xedin/swift,airspeedswift/swift,harlanhaskins/swift,shajrawi/swift,lorentey/swift,alblue/swift,lorentey/swift,apple/swift,huonw/swift,parkera/swift,apple/swift,nathawes/swift,atrick/swift,atrick/swift,jmgc/swift,CodaFi/swift,allevato/swift,xedin/swift,hooman/swift,xedin/swift,tkremenek/swift,shajrawi/swift,tjw/swift,allevato/swift,shahmishal/swift,devincoughlin/swift,lorentey/swift,gregomni/swift,allevato/swift,jckarter/swift,natecook1000/swift,austinzheng/swift,lorentey/swift,jopamer/swift,harlanhaskins/swift,jckarter/swift,aschwaighofer/swift,sschiau/swift,hooman/swift,xwu/swift,xwu/swift,hooman/swift,amraboelela/swift,tkremenek/swift,practicalswift/swift,huonw/swift,gribozavr/swift,shajrawi/swift,benlangmuir/swift,practicalswift/swift,roambotics/swift,stephentyrone/swift,karwa/swift,alblue/swift,tkremenek/swift,austinzheng/swift,rudkx/swift,airspeedswift/swift,danielmartin/swift,harlanhaskins/swift,jopamer/swift,stephentyrone/swift,nathawes/swift,gribozavr/swift,brentdax/swift,aschwaighofer/swift,austinzheng/swift,amraboelela/swift,austinzheng/swift,benlangmuir/swift,jckarter/swift,allevato/swift,jmgc/swift,shahmishal/swift,airspeedswift/swift,harlanhaskins/swift,brentdax/swift,roambotics/swift,CodaFi/swift,tjw/swift,hooman/swift,JGiola/swift,tjw/swift,shahmishal/swift,tjw/swift,aschwaighofer/swift,stephentyrone/swift,glessard/swift,roambotics/swift,aschwaighofer/swift,ahoppen/swift,huonw/swift,austinzheng/swift,jopamer/swift,sschiau/swift,alblue/swift,allevato/swift,harlanhaskins/swift,apple/swift,shahmishal/swift,practicalswift/swift,sschiau/swift,brentdax/swift,parkera/swift,devincoughlin/swift,nathawes/swift,gribozavr/swift,roambotics/swift,benlangmuir/swift,amraboelela/swift,gregomni/swift,roambotics/swift,atrick/swift,parkera/swift,ahoppen/swift,karwa/swift,JGiola/swift,parkera/swift,glessard/swift,lorentey/swift,devincoughlin/swift,JGiola/swift,sschiau/swift,natecook1000/swift,amraboelela/swift,devincoughlin/swift,shajrawi/swift,tkremenek/swift,nathawes/swift,atrick/swift,benlangmuir/swift,allevato/swift,lorentey/swift,atrick/swift,shajrawi/swift,jckarter/swift,xwu/swift,glessard/swift,xwu/swift,hooman/swift,practicalswift/swift,rudkx/swift,tkremenek/swift,JGiola/swift,xwu/swift,karwa/swift,gregomni/swift,practicalswift/swift,xedin/swift,danielmartin/swift,stephentyrone/swift,parkera/swift,airspeedswift/swift,tkremenek/swift,hooman/swift,natecook1000/swift,jmgc/swift,devincoughlin/swift,JGiola/swift,aschwaighofer/swift,jopamer/swift,natecook1000/swift,gregomni/swift,aschwaighofer/swift,jopamer/swift,alblue/swift,huonw/swift,xedin/swift,atrick/swift,CodaFi/swift,tkremenek/swift,aschwaighofer/swift,danielmartin/swift,tjw/swift,shajrawi/swift,jmgc/swift,brentdax/swift,stephentyrone/swift,devincoughlin/swift,jopamer/swift,karwa/swift,danielmartin/swift,apple/swift,shahmishal/swift,parkera/swift,natecook1000/swift,CodaFi/swift,glessard/swift,jmgc/swift,tjw/swift,devincoughlin/swift,roambotics/swift,CodaFi/swift,ahoppen/swift,rudkx/swift,harlanhaskins/swift,karwa/swift,rudkx/swift,JGiola/swift,CodaFi/swift,gribozavr/swift,shajrawi/swift,gribozavr/swift,brentdax/swift,practicalswift/swift