[SIL.rst] Document an extra check we now perform on noreturn.
[SIL.rst] Document an extra check we now perform on noreturn.

Swift SVN r6668

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