Fix a logic error in SimplifyCFG. isReachable is only used as part of NDEBUG.
Fix a logic error in SimplifyCFG. isReachable is only used as part of NDEBUG.

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