Add a section to ARCOptimization.rst describing RCIdentity.
Add a section to ARCOptimization.rst describing RCIdentity.

Swift SVN r32286

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