Mark ~Cleanup() virtual to silence "has virtual functions but non-virtual destructor" warnings.
Mark ~Cleanup() virtual to silence "has virtual functions but non-virtual destructor" warnings.

Swift SVN r1378

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