Mark some more string builders as @readonly.
Mark some more string builders as @readonly.

This accelerates Richards by 4X because we don't need to construct debug strings such as:

debug("TCB \(tcb!.id) state \(tcb!.state.bits)")



Swift SVN r20853

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