Stop simple_display from crashing
Stop simple_display from crashing

All code-paths in simple-display led to the llvm_unreachable being hit.
Returning from the switch-cases lets us not do that, which is good.

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