[silgenpattern] Rename an EnumElementDecl value from elt -> eltDecl.
[silgenpattern] Rename an EnumElementDecl value from elt -> eltDecl.

Since we are working with values here, it can be confusing when reading the code
that elt is an EnumElementDecl. The rename to eltDecl will make it much clearer.

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