[silgen] Clean up RValue::isPlus{One,Zero}().
[silgen] Clean up RValue::isPlus{One,Zero}().

parkera/swift,allevato/swift,shajrawi/swift,tjw/swift,parkera/swift,stephentyrone/swift,tkremenek/swift,natecook1000/swift,alblue/swift,parkera/swift,gribozavr/swift,aschwaighofer/swift,shajrawi/swift,austinzheng/swift,nathawes/swift,airspeedswift/swift,jckarter/swift,allevato/swift,tkremenek/swift,return/swift,shajrawi/swift,xwu/swift,rudkx/swift,natecook1000/swift,uasys/swift,swiftix/swift,allevato/swift,xedin/swift,harlanhaskins/swift,rudkx/swift,shahmishal/swift,allevato/swift,swiftix/swift,roambotics/swift,danielmartin/swift,nathawes/swift,austinzheng/swift,devincoughlin/swift,huonw/swift,shajrawi/swift,karwa/swift,danielmartin/swift,huonw/swift,CodaFi/swift,airspeedswift/swift,glessard/swift,gregomni/swift,karwa/swift,jckarter/swift,frootloops/swift,ahoppen/swift,gribozavr/swift,parkera/swift,xedin/swift,jckarter/swift,gribozavr/swift,shahmishal/swift,brentdax/swift,zisko/swift,xwu/swift,milseman/swift,rudkx/swift,tjw/swift,deyton/swift,return/swift,alblue/swift,apple/swift,devincoughlin/swift,xwu/swift,CodaFi/swift,jmgc/swift,practicalswift/swift,harlanhaskins/swift,OscarSwanros/swift,xedin/swift,parkera/swift,airspeedswift/swift,gribozavr/swift,swiftix/swift,gregomni/swift,karwa/swift,ahoppen/swift,xwu/swift,atrick/swift,allevato/swift,jmgc/swift,JGiola/swift,jckarter/swift,devincoughlin/swift,hooman/swift,tjw/swift,apple/swift,OscarSwanros/swift,stephentyrone/swift,practicalswift/swift,apple/swift,lorentey/swift,shajrawi/swift,zisko/swift,milseman/swift,practicalswift/swift,rudkx/swift,return/swift,natecook1000/swift,nathawes/swift,alblue/swift,apple/swift,alblue/swift,nathawes/swift,return/swift,frootloops/swift,atrick/swift,gregomni/swift,xedin/swift,benlangmuir/swift,swiftix/swift,amraboelela/swift,xwu/swift,frootloops/swift,roambotics/swift,lorentey/swift,hooman/swift,amraboelela/swift,austinzheng/swift,CodaFi/swift,apple/swift,swiftix/swift,roambotics/swift,aschwaighofer/swift,nathawes/swift,JGiola/swift,shajrawi/swift,atrick/swift,sschiau/swift,airspeedswift/swift,jckarter/swift,zisko/swift,frootloops/swift,benlangmuir/swift,uasys/swift,nathawes/swift,stephentyrone/swift,harlanhaskins/swift,OscarSwanros/swift,danielmartin/swift,parkera/swift,sschiau/swift,jmgc/swift,practicalswift/swift,shajrawi/swift,karwa/swift,aschwaighofer/swift,parkera/swift,devincoughlin/swift,jckarter/swift,practicalswift/swift,huonw/swift,harlanhaskins/swift,brentdax/swift,brentdax/swift,shahmishal/swift,swiftix/swift,OscarSwanros/swift,xedin/swift,amraboelela/swift,sschiau/swift,stephentyrone/swift,jopamer/swift,karwa/swift,CodaFi/swift,huonw/swift,gribozavr/swift,natecook1000/swift,sschiau/swift,devincoughlin/swift,atrick/swift,sschiau/swift,CodaFi/swift,ahoppen/swift,roambotics/swift,sschiau/swift,frootloops/swift,karwa/swift,OscarSwanros/swift,natecook1000/swift,jopamer/swift,tkremenek/swift,shahmishal/swift,danielmartin/swift,stephentyrone/swift,alblue/swift,jopamer/swift,xwu/swift,stephentyrone/swift,OscarSwanros/swift,amraboelela/swift,ahoppen/swift,return/swift,natecook1000/swift,sschiau/swift,frootloops/swift,brentdax/swift,hooman/swift,aschwaighofer/swift,aschwaighofer/swift,glessard/swift,austinzheng/swift,roambotics/swift,hooman/swift,return/swift,jopamer/swift,practicalswift/swift,jmgc/swift,zisko/swift,allevato/swift,uasys/swift,harlanhaskins/swift,alblue/swift,apple/swift,rudkx/swift,tjw/swift,brentdax/swift,shahmishal/swift,lorentey/swift,roambotics/swift,benlangmuir/swift,gregomni/swift,JGiola/swift,shahmishal/swift,milseman/swift,sschiau/swift,uasys/swift,aschwaighofer/swift,return/swift,zisko/swift,lorentey/swift,deyton/swift,uasys/swift,rudkx/swift,austinzheng/swift,lorentey/swift,zisko/swift,harlanhaskins/swift,jmgc/swift,tjw/swift,amraboelela/swift,tkremenek/swift,CodaFi/swift,zisko/swift,nathawes/swift,uasys/swift,jckarter/swift,austinzheng/swift,hooman/swift,brentdax/swift,JGiola/swift,tkremenek/swift,gribozavr/swift,glessard/swift,airspeedswift/swift,deyton/swift,hooman/swift,danielmartin/swift,parkera/swift,ahoppen/swift,gregomni/swift,airspeedswift/swift,gregomni/swift,JGiola/swift,glessard/swift,huonw/swift,jmgc/swift,deyton/swift,xwu/swift,atrick/swift,lorentey/swift,milseman/swift,shajrawi/swift,ahoppen/swift,milseman/swift,jmgc/swift,gribozavr/swift,amraboelela/swift,milseman/swift,austinzheng/swift,frootloops/swift,alblue/swift,uasys/swift,hooman/swift,natecook1000/swift,devincoughlin/swift,glessard/swift,benlangmuir/swift,benlangmuir/swift,amraboelela/swift,gribozavr/swift,danielmartin/swift,lorentey/swift,atrick/swift,huonw/swift,shahmishal/swift,tjw/swift,allevato/swift,danielmartin/swift,tkremenek/swift,practicalswift/swift,deyton/swift,harlanhaskins/swift,swiftix/swift,huonw/swift,jopamer/swift,karwa/swift,lorentey/swift,brentdax/swift,tjw/swift,devincoughlin/swift,benlangmuir/swift,karwa/swift,jopamer/swift,milseman/swift,shahmishal/swift,xedin/swift,aschwaighofer/swift,OscarSwanros/swift,practicalswift/swift,airspeedswift/swift,tkremenek/swift,devincoughlin/swift,deyton/swift,dey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