[copy-propagation] Finish plumbing through InstModCallbacks into one deletion utility that I missed.
[copy-propagation] Finish plumbing through InstModCallbacks into one deletion utility that I missed.

tkremenek/swift,parkera/swift,benlangmuir/swift,JGiola/swift,benlangmuir/swift,apple/swift,glessard/swift,roambotics/swift,ahoppen/swift,apple/swift,gregomni/swift,rudkx/swift,JGiola/swift,roambotics/swift,parkera/swift,xwu/swift,JGiola/swift,benlangmuir/swift,hooman/swift,xwu/swift,ahoppen/swift,benlangmuir/swift,gregomni/swift,gregomni/swift,benlangmuir/swift,atrick/swift,hooman/swift,parkera/swift,tkremenek/swift,parkera/swift,roambotics/swift,xwu/swift,parkera/swift,JGiola/swift,JGiola/swift,parkera/swift,xwu/swift,tkremenek/swift,apple/swift,xwu/swift,ahoppen/swift,rudkx/swift,roambotics/swift,parkera/swift,glessard/swift,parkera/swift,atrick/swift,apple/swift,tkremenek/swift,glessard/swift,benlangmuir/swift,ahoppen/swift,atrick/swift,apple/swift,rudkx/swift,tkremenek/swift,tkremenek/swift,atrick/swift,ahoppen/swift,gregomni/swift,glessard/swift,atrick/swift,gregomni/swift,gregomni/swift,JGiola/swift,roambotics/swift,atrick/swift,hooman/swift,hooman/swift,xwu/swift,rudkx/swift,roambotics/swift,rudkx/swift,tkremenek/swift,rudkx/swift,hooman/swift,hooman/swift,xwu/swift,glessard/swift,apple/swift,ahoppen/swift,hooman/swift,glessard/swift