IRGen: Update ObjC mangling not to depend on attr.
IRGen: Update ObjC mangling not to depend on attr.

Oops, missed a spot where it was referring to 'DeclAttributes::ObjC' directly instead of going through the accessor. This should make removing [objc] from the examples work.

Swift SVN r4100

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