Add a comment about the use of the function attribute.
Add a comment about the use of the function attribute.

Swift SVN r24235

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