Fix InstructionComparer for ref_element_addr
Fix InstructionComparer for ref_element_addr

InstructionComparer should only check for equality on additional state,
not operands. Fix visitRefElementAddr which was not using this common
pattern.

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