[runtime] Add support for verifying that all known protocol conformance descriptors are valid.
[runtime] Add support for verifying that all known protocol conformance descriptors are valid.

rdar://34222540

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