[dfe] Change Impl to be a stongly typed PointerUnion instead of a union.
[dfe] Change Impl to be a stongly typed PointerUnion instead of a union.

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