Serialization: Remove a bit of dead code from SILFormat.h
Serialization: Remove a bit of dead code from SILFormat.h

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