[test] Clang is now more strict about underlying type enums
[test] Clang is now more strict about underlying type enums

As of c90e198107431f64b73686bdce31c293e3380ac7, clang is now more strict
about parsing of enum-base in order to follow C++11 rules.

glessard/swift,nathawes/swift,nathawes/swift,JGiola/swift,JGiola/swift,airspeedswift/swift,ahoppen/swift,stephentyrone/swift,xwu/swift,apple/swift,parkera/swift,CodaFi/swift,tkremenek/swift,xwu/swift,gregomni/swift,jmgc/swift,tkremenek/swift,JGiola/swift,nathawes/swift,roambotics/swift,stephentyrone/swift,allevato/swift,gregomni/swift,airspeedswift/swift,jckarter/swift,rudkx/swift,parkera/swift,roambotics/swift,stephentyrone/swift,benlangmuir/swift,apple/swift,airspeedswift/swift,gregomni/swift,nathawes/swift,nathawes/swift,parkera/swift,parkera/swift,allevato/swift,xwu/swift,glessard/swift,ahoppen/swift,atrick/swift,xwu/swift,rudkx/swift,atrick/swift,nathawes/swift,tkremenek/swift,tkremenek/swift,hooman/swift,allevato/swift,nathawes/swift,apple/swift,hooman/swift,JGiola/swift,jckarter/swift,CodaFi/swift,hooman/swift,glessard/swift,parkera/swift,jmgc/swift,roambotics/swift,tkremenek/swift,JGiola/swift,hooman/swift,benlangmuir/swift,gregomni/swift,jckarter/swift,tkremenek/swift,gregomni/swift,roambotics/swift,airspeedswift/swift,glessard/swift,hooman/swift,stephentyrone/swift,rudkx/swift,roambotics/swift,stephentyrone/swift,rudkx/swift,ahoppen/swift,atrick/swift,parkera/swift,rudkx/swift,hooman/swift,glessard/swift,benlangmuir/swift,CodaFi/swift,ahoppen/swift,benlangmuir/swift,CodaFi/swift,ahoppen/swift,allevato/swift,jmgc/swift,JGiola/swift,parkera/swift,atrick/swift,gregomni/swift,benlangmuir/swift,apple/swift,jckarter/swift,rudkx/swift,airspeedswift/swift,atrick/swift,benlangmuir/swift,ahoppen/swift,tkremenek/swift,airspeedswift/swift,xwu/swift,parkera/swift,apple/swift,stephentyrone/swift,atrick/swift,roambotics/swift,jckarter/swift,CodaFi/swift,glessard/swift,allevato/swift,allevato/swift,stephentyrone/swift,jckarter/swift,xwu/swift,allevato/swift,jmgc/swift,jmgc/swift,hooman/swift,xwu/swift,CodaFi/swift,apple/swift,jmgc/swift,jckarter/swift,airspeedswift/swift,CodaFi/swift,jmgc/swift