TypeChecker: Allow [objc] decls to "overload".
TypeChecker: Allow [objc] decls to "overload".

Since it's valid for an ObjC or ObjC-derived class to have methods 'foo:' and 'foo:bar:', Swift's prohibition on derived methods overloading base methods can't apply as-is.

Swift SVN r4005

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