Fix WeakMirror test: extend weak referent.
Fix WeakMirror test: extend weak referent.

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