Add a simple utility to diff the results of automatically omitting needless words.
Add a simple utility to diff the results of automatically omitting needless words.

Helps with the exploration of rdar://problem/22232287.

Swift SVN r31184

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