[CSRanking] Amend concrete-over-protocol logic to only do an is-a check
[CSRanking] Amend concrete-over-protocol logic to only do an is-a check

As discussed in #18951, we don't want to be comparing two different protocol decls here, as that could lead to spurious 'is more specialized' results. I'm not aware of any case that currently trips this logic up though, so no tests to accompany.

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