[IRGen] Remove unused field from LazyOpaqueInfo
[IRGen] Remove unused field from LazyOpaqueInfo

Addresses rdar://problem/50376440.

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