[cast-optimizer] Assert and clarify in comments that bridged casts are not possible in certain cases yet
[cast-optimizer] Assert and clarify in comments that bridged casts are not possible in certain cases yet

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