[stdlib] Remove obsolete _precondition check
[stdlib] Remove obsolete _precondition check

Range now guarantees it won't be inverted.

Swift SVN r20948

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