Revert "AST: UnboundGenericTypes are not legal SIL types"
Revert "AST: UnboundGenericTypes are not legal SIL types"

Unfortunately DebugInfo emission temporarily constructs
unbound generic types inside SIL types.

This reverts commit 58f165a5624748117b5471ceb70468ff66110665.

Fixes <rdar://problem/35729528>.

airspeedswift/swift,jckarter/swift,jmgc/swift,rudkx/swift,xedin/swift,lorentey/swift,benlangmuir/swift,hooman/swift,lorentey/swift,tkremenek/swift,ahoppen/swift,atrick/swift,alblue/swift,glessard/swift,danielmartin/swift,huonw/swift,jckarter/swift,zisko/swift,JGiola/swift,karwa/swift,parkera/swift,huonw/swift,sschiau/swift,lorentey/swift,aschwaighofer/swift,roambotics/swift,practicalswift/swift,gribozavr/swift,parkera/swift,practicalswift/swift,JGiola/swift,roambotics/swift,parkera/swift,glessard/swift,zisko/swift,gribozavr/swift,practicalswift/swift,CodaFi/swift,frootloops/swift,ahoppen/swift,harlanhaskins/swift,apple/swift,karwa/swift,xwu/swift,xwu/swift,CodaFi/swift,JGiola/swift,karwa/swift,jckarter/swift,stephentyrone/swift,gregomni/swift,glessard/swift,xedin/swift,lorentey/swift,allevato/swift,hooman/swift,austinzheng/swift,sschiau/swift,apple/swift,jopamer/swift,sschiau/swift,CodaFi/swift,tkremenek/swift,alblue/swift,danielmartin/swift,zisko/swift,jopamer/swift,jmgc/swift,austinzheng/swift,huonw/swift,nathawes/swift,glessard/swift,nathawes/swift,rudkx/swift,sschiau/swift,rudkx/swift,harlanhaskins/swift,frootloops/swift,hooman/swift,devincoughlin/swift,allevato/swift,xedin/swift,jopamer/swift,parkera/swift,benlangmuir/swift,tjw/swift,tkremenek/swift,amraboelela/swift,brentdax/swift,gribozavr/swift,sschiau/swift,sschiau/swift,frootloops/swift,natecook1000/swift,rudkx/swift,practicalswift/swift,tjw/swift,shahmishal/swift,huonw/swift,harlanhaskins/swift,jmgc/swift,aschwaighofer/swift,natecook1000/swift,parkera/swift,devincoughlin/swift,airspeedswift/swift,practicalswift/swift,xwu/swift,CodaFi/swift,gribozavr/swift,brentdax/swift,devincoughlin/swift,aschwaighofer/swift,alblue/swift,airspeedswift/swift,tjw/swift,aschwaighofer/swift,jopamer/swift,gregomni/swift,practicalswift/swift,parkera/swift,gregomni/swift,aschwaighofer/swift,tjw/swift,sschiau/swift,roambotics/swift,zisko/swift,stephentyrone/swift,frootloops/swift,atrick/swift,zisko/swift,gregomni/swift,practicalswift/swift,jmgc/swift,zisko/swift,shajrawi/swift,nathawes/swift,tkremenek/swift,karwa/swift,brentdax/swift,JGiola/swift,hooman/swift,aschwaighofer/swift,xedin/swift,shahmishal/swift,JGiola/swift,brentdax/swift,parkera/swift,rudkx/swift,gribozavr/swift,karwa/swift,amraboelela/swift,amraboelela/swift,nathawes/swift,shahmishal/swift,tjw/swift,roambotics/swift,devincoughlin/swift,harlanhaskins/swift,natecook1000/swift,austinzheng/swift,xwu/swift,gregomni/swift,apple/swift,sschiau/swift,amraboelela/swift,karwa/swift,danielmartin/swift,brentdax/swift,shajrawi/swift,xedin/swift,hooman/swift,tjw/swift,amraboelela/swift,harlanhaskins/swift,danielmartin/swift,shahmishal/swift,atrick/swift,atrick/swift,rudkx/swift,CodaFi/swift,gribozavr/swift,xedin/swift,devincoughlin/swift,shajrawi/swift,tkremenek/swift,allevato/swift,frootloops/swift,amraboelela/swift,harlanhaskins/swift,stephentyrone/swift,natecook1000/swift,stephentyrone/swift,practicalswift/swift,amraboelela/swift,natecook1000/swift,benlangmuir/swift,tkremenek/swift,alblue/swift,gribozavr/swift,alblue/swift,benlangmuir/swift,natecook1000/swift,apple/swift,natecook1000/swift,CodaFi/swift,roambotics/swift,jopamer/swift,allevato/swift,atrick/swift,karwa/swift,shahmishal/swift,brentdax/swift,xwu/swift,hooman/swift,allevato/swift,jopamer/swift,zisko/swift,austinzheng/swift,austinzheng/swift,ahoppen/swift,devincoughlin/swift,karwa/swift,nathawes/swift,huonw/swift,jmgc/swift,atrick/swift,lorentey/swift,frootloops/swift,shajrawi/swift,harlanhaskins/swift,alblue/swift,jckarter/swift,allevato/swift,austinzheng/swift,huonw/swift,nathawes/swift,gregomni/swift,jckarter/swift,tjw/swift,tkremenek/swift,hooman/swift,JGiola/swift,airspeedswift/swift,lorentey/swift,xedin/swift,benlangmuir/swift,apple/swift,devincoughlin/swift,xwu/swift,frootloops/swift,airspeedswift/swift,devincoughlin/swift,jopamer/swift,glessard/swift,shahmishal/swift,airspeedswift/swift,parkera/swift,aschwaighofer/swift,alblue/swift,jckarter/swift,danielmartin/swift,huonw/swift,austinzheng/swift,danielmartin/swift,shahmishal/swift,shajrawi/swift,lorentey/swift,CodaFi/swift,apple/swift,stephentyrone/swift,stephentyrone/swift,gribozavr/swift,xedin/swift,xwu/swift,shajrawi/swift,airspeedswift/swift,stephentyrone/swift,lorentey/swift,shajrawi/swift,jmgc/swift,ahoppen/swift,benlangmuir/swift,roambotics/swift,jmgc/swift,nathawes/swift,glessard/swift,shajrawi/swift,brentdax/swift,allevato/swift,jckarter/swift,ahoppen/swift,danielmartin/swift,ahoppen/swift,shahmishal/swift