[ClangImporter] Remove workaround for old NS_ERROR_ENUM import logic (#27267)
[ClangImporter] Remove workaround for old NS_ERROR_ENUM import logic (#27267)

At one point the enum in an NS_ERROR_ENUM would get mapped to the
struct that the ClangImporter synthesized for it, rather than the code
enum that directly corresponded to what was declared in Objective-C.
That's not how the importer works anymore, though; we can trust that
the right type is picked without additional adjustments.
harlanhaskins/swift,stephentyrone/swift,tkremenek/swift,devincoughlin/swift,JGiola/swift,ahoppen/swift,hooman/swift,ahoppen/swift,jckarter/swift,allevato/swift,sschiau/swift,aschwaighofer/swift,CodaFi/swift,gregomni/swift,glessard/swift,gregomni/swift,CodaFi/swift,karwa/swift,harlanhaskins/swift,jmgc/swift,devincoughlin/swift,airspeedswift/swift,airspeedswift/swift,apple/swift,jmgc/swift,hooman/swift,karwa/swift,benlangmuir/swift,gribozavr/swift,jmgc/swift,gregomni/swift,JGiola/swift,devincoughlin/swift,apple/swift,allevato/swift,jmgc/swift,parkera/swift,jmgc/swift,sschiau/swift,xwu/swift,rudkx/swift,devincoughlin/swift,roambotics/swift,tkremenek/swift,airspeedswift/swift,aschwaighofer/swift,sschiau/swift,lorentey/swift,aschwaighofer/swift,devincoughlin/swift,xwu/swift,ahoppen/swift,karwa/swift,devincoughlin/swift,aschwaighofer/swift,benlangmuir/swift,karwa/swift,jckarter/swift,airspeedswift/swift,parkera/swift,jckarter/swift,rudkx/swift,lorentey/swift,gribozavr/swift,CodaFi/swift,JGiola/swift,ahoppen/swift,gregomni/swift,roambotics/swift,stephentyrone/swift,atrick/swift,tkremenek/swift,ahoppen/swift,benlangmuir/swift,jckarter/swift,gregomni/swift,rudkx/swift,airspeedswift/swift,karwa/swift,stephentyrone/swift,nathawes/swift,sschiau/swift,rudkx/swift,tkremenek/swift,CodaFi/swift,roambotics/swift,sschiau/swift,airspeedswift/swift,jmgc/swift,JGiola/swift,harlanhaskins/swift,atrick/swift,atrick/swift,parkera/swift,allevato/swift,nathawes/swift,jckarter/swift,hooman/swift,benlangmuir/swift,jckarter/swift,atrick/swift,nathawes/swift,jckarter/swift,gregomni/swift,JGiola/swift,parkera/swift,JGiola/swift,lorentey/swift,rudkx/swift,parkera/swift,allevato/swift,stephentyrone/swift,lorentey/swift,harlanhaskins/swift,apple/swift,glessard/swift,glessard/swift,tkremenek/swift,apple/swift,atrick/swift,aschwaighofer/swift,nathawes/swift,glessard/swift,glessard/swift,sschiau/swift,lorentey/swift,xwu/swift,lorentey/swift,jmgc/swift,stephentyrone/swift,harlanhaskins/swift,allevato/swift,gribozavr/swift,ahoppen/swift,roambotics/swift,nathawes/swift,atrick/swift,gribozavr/swift,tkremenek/swift,benlangmuir/swift,lorentey/swift,CodaFi/swift,xwu/swift,gribozavr/swift,roambotics/swift,harlanhaskins/swift,gribozavr/swift,devincoughlin/swift,hooman/swift,gribozavr/swift,sschiau/swift,harlanhaskins/swift,stephentyrone/swift,devincoughlin/swift,hooman/swift,benlangmuir/swift,xwu/swift,apple/swift,lorentey/swift,nathawes/swift,gribozavr/swift,airspeedswift/swift,nathawes/swift,apple/swift,tkremenek/swift,parkera/swift,stephentyrone/swift,allevato/swift,aschwaighofer/swift,karwa/swift,karwa/swift,CodaFi/swift,aschwaighofer/swift,karwa/swift,CodaFi/swift,glessard/swift,xwu/swift,parkera/swift,xwu/swift,sschiau/swift,allevato/swift,rudkx/swift,roambotics/swift,hooman/swift,hooman/swift,parkera/swift