unittest/Reflection: Test that TypeRefs remain unique after substitution
unittest/Reflection: Test that TypeRefs remain unique after substitution

A TypeRef for C<T, U>, substituted to C<Int, Int>, should have the same
pointer identity as a C<Int, Int> created by other means. This prevents
repeating reflective layout work if we've already seen a particular
instantiation of a generic type.

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