In ARCOpts be clear about when the IR changes.
In ARCOpts be clear about when the IR changes.

Just to cleanup code that confused me and make it easier to invalidate.

Swift SVN r13676

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