Have the ASTWalker walk type-checked raw value exprs.
Have the ASTWalker walk type-checked raw value exprs.

We don't let it see the pre-type-checked LiteralExpr yet because EnumElementDecls need to do its own checking.

Swift SVN r8547

deyton/swift,KrishMunot/swift,jopamer/swift,zisko/swift,emilstahl/swift,benlangmuir/swift,lorentey/swift,stephentyrone/swift,frootloops/swift,amraboelela/swift,ahoppen/swift,jopamer/swift,harlanhaskins/swift,amraboelela/swift,kentya6/swift,atrick/swift,shajrawi/swift,swiftix/swift.old,harlanhaskins/swift,OscarSwanros/swift,sdulal/swift,modocache/swift,emilstahl/swift,rudkx/swift,jckarter/swift,nathawes/swift,practicalswift/swift,uasys/swift,frootloops/swift,brentdax/swift,jopamer/swift,Jnosh/swift,KrishMunot/swift,hooman/swift,sdulal/swift,russbishop/swift,SwiftAndroid/swift,dduan/swift,uasys/swift,tardieu/swift,milseman/swift,hooman/swift,kperryua/swift,hughbe/swift,harlanhaskins/swift,huonw/swift,codestergit/swift,mightydeveloper/swift,slavapestov/swift,devincoughlin/swift,ken0nek/swift,frootloops/swift,ken0nek/swift,dduan/swift,allevato/swift,gregomni/swift,modocache/swift,JaSpa/swift,lorentey/swift,harlanhaskins/swift,airspeedswift/swift,kentya6/swift,mightydeveloper/swift,alblue/swift,MukeshKumarS/Swift,slavapestov/swift,ben-ng/swift,ken0nek/swift,jmgc/swift,therealbnut/swift,tardieu/swift,shahmishal/swift,emilstahl/swift,austinzheng/swift,frootloops/swift,roambotics/swift,tardieu/swift,danielmartin/swift,arvedviehweger/swift,atrick/swift,LeoShimonaka/swift,huonw/swift,hughbe/swift,ben-ng/swift,djwbrown/swift,gregomni/swift,aschwaighofer/swift,MukeshKumarS/Swift,calebd/swift,karwa/swift,harlanhaskins/swift,jtbandes/swift,Ivacker/swift,glessard/swift,gribozavr/swift,parkera/swift,karwa/swift,swiftix/swift,cbrentharris/swift,mightydeveloper/swift,shajrawi/swift,codestergit/swift,OscarSwanros/swift,swiftix/swift.old,russbishop/swift,lorentey/swift,cbrentharris/swift,sschiau/swift,modocache/swift,KrishMunot/swift,jmgc/swift,gmilos/swift,JGiola/swift,sdulal/swift,return/swift,ahoppen/swift,jtbandes/swift,dduan/swift,KrishMunot/swift,khizkhiz/swift,kusl/swift,ken0nek/swift,parkera/swift,tardieu/swift,sdulal/swift,aschwaighofer/swift,russbishop/swift,mightydeveloper/swift,deyton/swift,roambotics/swift,JaSpa/swift,emilstahl/swift,nathawes/swift,bitjammer/swift,aschwaighofer/swift,swiftix/swift.old,hughbe/swift,modocache/swift,xedin/swift,ben-ng/swift,hooman/swift,danielmartin/swift,return/swift,brentdax/swift,devincoughlin/swift,russbishop/swift,austinzheng/swift,adrfer/swift,mightydeveloper/swift,KrishMunot/swift,manavgabhawala/swift,calebd/swift,hooman/swift,cbrentharris/swift,xwu/swift,gregomni/swift,hughbe/swift,kusl/swift,xwu/swift,xwu/swift,felix91gr/swift,parkera/swift,brentdax/swift,huonw/swift,shajrawi/swift,devincoughlin/swift,stephentyrone/swift,jckarter/swift,jckarter/swift,Ivacker/swift,ben-ng/swift,austinzheng/swift,jtbandes/swift,adrfer/swift,austinzheng/swift,mightydeveloper/swift,jopamer/swift,felix91gr/swift,slavapestov/swift,therealbnut/swift,xedin/swift,swiftix/swift.old,MukeshKumarS/Swift,sschiau/swift,jtbandes/swift,slavapestov/swift,kstaring/swift,Ivacker/swift,frootloops/swift,shahmishal/swift,roambotics/swift,IngmarStein/swift,ben-ng/swift,khizkhiz/swift,roambotics/swift,modocache/swift,jckarter/swift,arvedviehweger/swift,return/swift,SwiftAndroid/swift,Ivacker/swift,CodaFi/swift,felix91gr/swift,SwiftAndroid/swift,sschiau/swift,allevato/swift,return/swift,jtbandes/swift,amraboelela/swift,CodaFi/swift,bitjammer/swift,adrfer/swift,natecook1000/swift,kperryua/swift,emilstahl/swift,deyton/swift,return/swift,jmgc/swift,benlangmuir/swift,gottesmm/swift,gregomni/swift,kentya6/swift,zisko/swift,CodaFi/swift,roambotics/swift,benlangmuir/swift,dduan/swift,arvedviehweger/swift,milseman/swift,bitjammer/swift,Ivacker/swift,shahmishal/swift,tardieu/swift,slavapestov/swift,brentdax/swift,arvedviehweger/swift,xedin/swift,karwa/swift,tkremenek/swift,glessard/swift,apple/swift,xedin/swift,airspeedswift/swift,sdulal/swift,nathawes/swift,roambotics/swift,Ivacker/swift,alblue/swift,bitjammer/swift,tkremenek/swift,ken0nek/swift,uasys/swift,shajrawi/swift,return/swift,lorentey/swift,milseman/swift,practicalswift/swift,huonw/swift,shajrawi/swift,OscarSwanros/swift,therealbnut/swift,swiftix/swift,gribozavr/swift,milseman/swift,johnno1962d/swift,hooman/swift,jopamer/swift,MukeshKumarS/Swift,manavgabhawala/swift,shajrawi/swift,deyton/swift,natecook1000/swift,shahmishal/swift,Jnosh/swift,swiftix/swift.old,kusl/swift,bitjammer/swift,dduan/swift,nathawes/swift,shahmishal/swift,karwa/swift,khizkhiz/swift,LeoShimonaka/swift,tjw/swift,cbrentharris/swift,mightydeveloper/swift,lorentey/swift,allevato/swift,OscarSwanros/swift,xwu/swift,alblue/swift,natecook1000/swift,devincoughlin/swift,zisko/swift,kusl/swift,IngmarStein/swift,apple/swift,JaSpa/swift,devincoughlin/swift,practicalswift/swift,codestergit/swift,glessard/swift,gottesmm/swift,kusl/swift,uasys/swift,danielmartin/swift,kstaring/swift,aschwaighofer/swift,gottesmm/swift,JGiola/swift,codestergit/swift,ahoppen/swift,gribozavr/swift,jopamer/swift,calebd/swift,swiftix/swift,sschiau/swift,tkremenek/swift,allevato/swift,swiftix/swift,JGiola/swift,bitjammer/swift,felix9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