tighten up some logic, principly by using dyn_cast instead of dyn_cast_or_null, NFC.
tighten up some logic, principly by using dyn_cast instead of dyn_cast_or_null,
NFC.


Swift SVN r16954

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