[AST] If a symbol has a type of a typealias that is not with leading underscore, accept it as public one.
[AST] If a symbol has a type of a typealias that is not with leading underscore, accept it as public one.

Note that if the typealias type is an internal one it will show up undeclared in the interface.
We currently allow this to avoid unintentionally hiding a public API.

Swift SVN r18627

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