Fix a warning about fallthrough in builds without assertions
Fix a warning about fallthrough in builds without assertions

Swift SVN r22463

khizkhiz/swift,devincoughlin/swift,gottesmm/swift,milseman/swift,djwbrown/swift,allevato/swift,tkremenek/swift,nathawes/swift,glessard/swift,shahmishal/swift,jopamer/swift,MukeshKumarS/Swift,parkera/swift,glessard/swift,lorentey/swift,gribozavr/swift,zisko/swift,shahmishal/swift,cbrentharris/swift,harlanhaskins/swift,ben-ng/swift,jckarter/swift,gregomni/swift,xwu/swift,shajrawi/swift,therealbnut/swift,bitjammer/swift,natecook1000/swift,allevato/swift,kentya6/swift,austinzheng/swift,gmilos/swift,karwa/swift,codestergit/swift,hooman/swift,practicalswift/swift,calebd/swift,jtbandes/swift,deyton/swift,tinysun212/swift-windows,IngmarStein/swift,felix91gr/swift,slavapestov/swift,nathawes/swift,alblue/swift,nathawes/swift,austinzheng/swift,djwbrown/swift,jmgc/swift,ben-ng/swift,arvedviehweger/swift,kstaring/swift,parkera/swift,ahoppen/swift,gribozavr/swift,johnno1962d/swift,LeoShimonaka/swift,rudkx/swift,arvedviehweger/swift,johnno1962d/swift,manavgabhawala/swift,bitjammer/swift,KrishMunot/swift,hughbe/swift,brentdax/swift,shahmishal/swift,deyton/swift,uasys/swift,danielmartin/swift,Jnosh/swift,harlanhaskins/swift,calebd/swift,CodaFi/swift,lorentey/swift,dduan/swift,gregomni/swift,slavapestov/swift,dduan/swift,cbrentharris/swift,Ivacker/swift,airspeedswift/swift,ben-ng/swift,sdulal/swift,benlangmuir/swift,shahmishal/swift,adrfer/swift,airspeedswift/swift,swiftix/swift.old,gottesmm/swift,bitjammer/swift,therealbnut/swift,calebd/swift,kperryua/swift,dduan/swift,aschwaighofer/swift,hughbe/swift,russbishop/swift,cbrentharris/swift,brentdax/swift,SwiftAndroid/swift,gmilos/swift,kusl/swift,frootloops/swift,mightydeveloper/swift,tkremenek/swift,mightydeveloper/swift,rudkx/swift,uasys/swift,huonw/swift,rudkx/swift,OscarSwanros/swift,natecook1000/swift,mightydeveloper/swift,MukeshKumarS/Swift,jtbandes/swift,MukeshKumarS/Swift,tkremenek/swift,tinysun212/swift-windows,sdulal/swift,felix91gr/swift,kperryua/swift,cbrentharris/swift,harlanhaskins/swift,ken0nek/swift,natecook1000/swift,kusl/swift,amraboelela/swift,rudkx/swift,russbishop/swift,calebd/swift,tjw/swift,manavgabhawala/swift,JaSpa/swift,hooman/swift,khizkhiz/swift,codestergit/swift,CodaFi/swift,CodaFi/swift,atrick/swift,frootloops/swift,johnno1962d/swift,allevato/swift,return/swift,nathawes/swift,brentdax/swift,uasys/swift,felix91gr/swift,ken0nek/swift,codestergit/swift,parkera/swift,hughbe/swift,jtbandes/swift,karwa/swift,jmgc/swift,xedin/swift,alblue/swift,jtbandes/swift,devincoughlin/swift,xwu/swift,harlanhaskins/swift,tjw/swift,airspeedswift/swift,JGiola/swift,arvedviehweger/swift,LeoShimonaka/swift,JaSpa/swift,swiftix/swift.old,bitjammer/swift,tinysun212/swift-windows,kstaring/swift,xedin/swift,JaSpa/swift,adrfer/swift,MukeshKumarS/Swift,xwu/swift,calebd/swift,dduan/swift,jckarter/swift,allevato/swift,Jnosh/swift,karwa/swift,danielmartin/swift,milseman/swift,djwbrown/swift,lorentey/swift,kusl/swift,LeoShimonaka/swift,emilstahl/swift,modocache/swift,sdulal/swift,frootloops/swift,Ivacker/swift,mightydeveloper/swift,practicalswift/swift,nathawes/swift,xedin/swift,Ivacker/swift,uasys/swift,parkera/swift,swiftix/swift.old,allevato/swift,alblue/swift,djwbrown/swift,Ivacker/swift,SwiftAndroid/swift,hooman/swift,gribozavr/swift,modocache/swift,kentya6/swift,tjw/swift,jckarter/swift,karwa/swift,benlangmuir/swift,return/swift,slavapestov/swift,russbishop/swift,tjw/swift,bitjammer/swift,JGiola/swift,glessard/swift,sdulal/swift,allevato/swift,apple/swift,lorentey/swift,modocache/swift,airspeedswift/swift,Ivacker/swift,milseman/swift,CodaFi/swift,ben-ng/swift,OscarSwanros/swift,apple/swift,Jnosh/swift,ben-ng/swift,KrishMunot/swift,emilstahl/swift,Jnosh/swift,Jnosh/swift,apple/swift,xwu/swift,parkera/swift,glessard/swift,IngmarStein/swift,stephentyrone/swift,codestergit/swift,lorentey/swift,JaSpa/swift,tkremenek/swift,manavgabhawala/swift,SwiftAndroid/swift,tardieu/swift,stephentyrone/swift,Ivacker/swift,gribozavr/swift,kstaring/swift,jopamer/swift,hooman/swift,atrick/swift,tardieu/swift,mightydeveloper/swift,swiftix/swift,gottesmm/swift,adrfer/swift,aschwaighofer/swift,shajrawi/swift,tkremenek/swift,tinysun212/swift-windows,rudkx/swift,Jnosh/swift,tjw/swift,amraboelela/swift,arvedviehweger/swift,LeoShimonaka/swift,russbishop/swift,austinzheng/swift,emilstahl/swift,natecook1000/swift,shajrawi/swift,swiftix/swift,russbishop/swift,stephentyrone/swift,djwbrown/swift,uasys/swift,arvedviehweger/swift,swiftix/swift,xedin/swift,hooman/swift,CodaFi/swift,JaSpa/swift,natecook1000/swift,jtbandes/swift,atrick/swift,natecook1000/swift,kentya6/swift,aschwaighofer/swift,stephentyrone/swift,adrfer/swift,practicalswift/swift,xedin/swift,deyton/swift,zisko/swift,jtbandes/swift,xedin/swift,parkera/swift,frootloops/swift,jopamer/swift,allevato/swift,khizkhiz/swift,tkremenek/swift,KrishMunot/swift,huonw/swift,felix91gr/swift,gmilos/swift,Ivacker/swift,karwa/swift,KrishMunot/swift,JaSpa/swift,roambotics/swift,austinzheng/swift,frootloops/swift,shahmishal/swift,amraboelela/swift,return/swift,therealbnut/swift,modocache/swift,devincoughlin/swift,benlangmuir/swift,parkera/swift,zisko/swift,russbishop/swift,frootloops/swift,devincoughlin/swift,swiftix/swift,danielmartin/swift,gmilos/swift,hughbe/swift,nathawes/swift,xedin/swift,slavapestov/swift,atrick/swift,modocache/swift,JaSpa/swift,kperryua/swift,manavgabhawala/swift,practicalswift/swift,tardieu/swift,hughbe/swift,danielmartin/swift,gribozavr/swift,dduan/swift,khizkhiz/swift,alblue/swift,swiftix/swift,gregomni/swift,JGiola/swift,shajrawi/swift,brentdax/swift,kusl/swift,gribozavr/swift,danielmartin/swift,djwbrown/swift,swiftix/swift,kusl/swift,LeoShimonaka/swift,stephentyrone/swift,brentdax/swift,aschwaighofer/swift,codestergit/swift,alblue/swift,dduan/swift,brentdax/swift,MukeshKumarS/Swift,devincoughlin/swift,emilstahl/swift,swiftix/swift.old,adrfer/swift,mightydeveloper/swift,milseman/swift,cbrentharris/swift,jmgc/swift,karwa/swift,return/swift,tardieu/swift,practicalswift/swift,sdulal/swift,therealbnut/swift,kentya6/swift,rudkx/swift,modocache/swift,cbrentharris/swift,gottesmm/swift,swiftix/swift.old,gribozavr/swift,jopamer/swift,devincoughlin/swift,CodaFi/swift,modocache/swift,gottesmm/swift,kentya6/swift,benlangmuir/swift,kperryua/swift,KrishMunot/swift,calebd/swift,apple/swift,jmgc/swift,IngmarStein/swift,dreamsxin/swift,kentya6/swift,swiftix/swift.old,adrfer/swift,jopamer/swift,amraboelela/swift,return/swift,gottesmm/swift,natecook1000/swift,gmilos/swift,huonw/swift,khizkhiz/swift,benlangmuir/swift,djwbrown/swift,xwu/swift,austinzheng/swift,ahoppen/swift,gregomni/swift,MukeshKumarS/Swift,harlanhaskins/swift,kstaring/swift,harlanhaskins/swift,calebd/swift,OscarSwanros/swift,johnno1962d/swift,khizkhiz/swift,SwiftAndroid/swift,sdulal/swift,hughbe/swift,therealbnut/swift,therealbnut/swift,danielmartin/swift,glessard/swift,jckarter/swift,ken0nek/swift,practicalswift/swift,swiftix/swift,jtbandes/swift,lorentey/swift,tjw/swift,ahoppen/swift,JGiola/swift,ben-ng/swift,shahmishal/swift,cbrentharris/swift,atrick/swift,frootloops/swift,jckarter/swift,kusl/swift,tinysun212/swift-windows,jmgc/swift,manavgabhawala/swift,alblue/swift,ken0nek/swift,karwa/swift,airspeedswift/swift,amraboelela/swift,JGiola/swift,austinzheng/swift,zisko/swift,airspeedswift/swift,kentya6/swift,sschiau/swift,milseman/swift,arvedviehweger/swift,kperryua/swift,emilstahl/swift,ken0nek/swift,shajrawi/swift,jopamer/swift,KrishMunot/swift,hughbe/swift,kentya6/swift,ben-ng/swift,deyton/swift,kusl/swift,ken0nek/swift,IngmarStein/swift,devincoughlin/swift,johnno1962d/swift,sschiau/swift,nathawes/swift,CodaFi/swift,sschiau/swift,Ivacker/swift,xedin/swift,tardieu/swift,gregomni/swift,deyton/swift,codestergit/swift,shajrawi/swift,hooman/swift,austinzheng/swift,milseman/swift,sdulal/swift,huonw/swift,roambotics/swift,apple/swift,SwiftAndroid/swift,ken0nek/swift,xwu/swift,kstaring/swift,khizkhiz/swift,sschiau/swift,felix91gr/swift,sschiau/swift,gregomni/swift,amraboelela/swift,emilstahl/swift,tkremenek/swift,huonw/swift,bitjammer/swift,slavapestov/swift,practicalswift/swift,karwa/swift,danielmartin/swift,sschiau/swift,airspeedswift/swift,MukeshKumarS/Swift,gottesmm/swift,roambotics/swift,xwu/swift,IngmarStein/swift,therealbnut/swift,tardieu/swift,deyton/swift,sschiau/swift,zisko/swift,ahoppen/swift,adrfer/swift,aschwaighofer/swift,mightydeveloper/swift,uasys/swift,shahmishal/swift,jmgc/swift,codestergit/swift,amraboelela/swift,roambotics/swift,roambotics/swift,tardieu/swift,milseman/swift,OscarSwanros/swift,jckarter/swift,stephentyrone/swift,tjw/swift,ahoppen/swift,uasys/swift,return/swift,zisko/swift,dduan/swift,kstaring/swift,return/swift,jopamer/swift,shajrawi/swift,OscarSwanros/swift,emilstahl/swift,benlangmuir/swift,bitjammer/swift,lorentey/swift,jckarter/swift,gmilos/swift,IngmarStein/swift,swiftix/swift.old,tinysun212/swift-windows,lorentey/swift,kperryua/swift,jmgc/swift,dreamsxin/swift,stephentyrone/swift,OscarSwanros/swift,shahmishal/swift,JGiola/swift,kusl/swift,kstaring/swift,gmilos/swift,SwiftAndroid/swift,johnno1962d/swift,tinysun212/swift-windows,sschiau/swift,aschwaighofer/swift,johnno1962d/swift,huonw/swift,kperryua/swift,slavapestov/swift,shajrawi/swift,mightydeveloper/swift,KrishMunot/swift,emilstahl/swift,IngmarStein/swift,aschwaighofer/swift,felix91gr/swift,russbishop/swift,parkera/swift,OscarSwanros/swift,apple/swift,slavapestov/swift,huonw/swift,felix91gr/swift,LeoShimonaka/swift,manavgabhawala/swift,swiftix/swift.old,harlanhaskins/swift,alblue/swift,roambotics/swift,LeoShimonaka/swift,zisko/swift,cbrentharris/swift,practicalswift/swift,brentdax/swift,gribozavr/swift,deyton/swift,SwiftAndroid/swift,manavgabhawala/swift,ahoppen/swift,Jnosh/swift,atrick/swift,arvedviehweger/swift,LeoShimonaka/swift,hooman/swift,glessard/swift,sdulal/swift,devincoughlin/swift