microoptimize IRGen's emitCondition a bit: instead of emitting a xor to  invert a condition, just output an inverted conditional branch (swap the  true/false dests).
microoptimize IRGen's emitCondition a bit: instead of emitting a xor to 
invert a condition, just output an inverted conditional branch (swap the 
true/false dests).


Swift SVN r2778

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