Hoist more early returns as early as possible.
Hoist more early returns as early as possible.

Swift SVN r25943

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