Demangler: remove dependency on swift::Optional
Demangler: remove dependency on swift::Optional

Not strictly required, but we are going to make the demangler self-contained
C++11 code for the benefit of users out of the compiler tree.


Swift SVN r20247

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