[MetadataReader] Remove the full `llvm::` qualification.
[MetadataReader] Remove the full `llvm::` qualification.

It's not needed. Pointed out by John McCall during his code
reviews.

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