Sema: Moved ExprWalker class out of applySolution()
Sema: Moved ExprWalker class out of applySolution()

Perhaps it's a matter of taste but that function is already
quite long. NFC

Swift SVN r29380

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