XCTest: Use the new convention for format strings
XCTest: Use the new convention for format strings

When asking XCTest to generate format strings for assertions, pass the
requested index + 100 to ask XCTest to generate a string without space
for the expressions themselves, and don't bother passing them either
(since the overlay isn't actually generating stringified expressons).

Addresses <rdar://problem/17597526>.

Swift SVN r19712

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