omitNeedlessWords: delete accidentally dead code
omitNeedlessWords: delete accidentally dead code

StringRef::drop_back returns a new string instead of mutating the
existing one, so this check would never actually make a
difference. Drat.

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