-ast-dump shouldn't crash on empty identifiers
-ast-dump shouldn't crash on empty identifiers

Swift SVN r153

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