[NFC] Remove MemberLookupTable::clear()
[NFC] Remove MemberLookupTable::clear()

The incremental name lookup cache no longer needs to chuck out the old tables.

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