Sema: Refactor class method override matching for generic subscripts
Sema: Refactor class method override matching for generic subscripts

Subscripts in generic context will soon have a
GenericFunctionType, so get ready to handle that.

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