Minor clean-ups and improvements as a preparation for the bridging casts optimizations.
Minor clean-ups and improvements as a preparation for the bridging casts optimizations.

Swift SVN r27099

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