IRGen: Move a few things from WitnessTableBuilderBase to FragileWitnessTableBuilder
IRGen: Move a few things from WitnessTableBuilderBase to FragileWitnessTableBuilder

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