stdlib: Add subscript and .null() interfaces to AutoreleasingUnsafePointer.
stdlib: Add subscript and .null() interfaces to AutoreleasingUnsafePointer.

To make it more UnsafePointer-like.

Swift SVN r19206

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