'-=' is valid on both signed/unsigned types
'-=' is valid on both signed/unsigned types

Also, make the output easier to review output "tables" of operators.

Swift SVN r7780

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