Add an assert to detect an instruction being added as an operand of itself.
Add an assert to detect an instruction being added as an operand of itself.

Swift SVN r16303

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