Don't crash in release mode if the Mangler encounters an Archetype without DeclContext.
Don't crash in release mode if the Mangler encounters an Archetype without
DeclContext.

Swift SVN r19210

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