Remove additional underflow checks.
Remove additional underflow checks.

Swift SVN r25823

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