[PrintAsObjC] Refactor printing of property ownership attributes
[PrintAsObjC] Refactor printing of property ownership attributes

Exhaustively switch over reference types, so that we'll know if any
new ones are added, and factor out a repeated check to see if
something's a retainable object type.

No functionality change.

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