Fix DenseMapInfo for swift::SILDeclRef: empty and tombstone keys were equal
Fix DenseMapInfo for swift::SILDeclRef: empty and tombstone keys were equal

No testcase, found by reading code.


Swift SVN r6911

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