Add convenience initializers for `MemberDeclList`
Add convenience initializers for `MemberDeclList`

apple/swift,rudkx/swift,rudkx/swift,roambotics/swift,JGiola/swift,atrick/swift,JGiola/swift,gregomni/swift,atrick/swift,rudkx/swift,apple/swift,benlangmuir/swift,glessard/swift,rudkx/swift,glessard/swift,apple/swift,glessard/swift,JGiola/swift,gregomni/swift,JGiola/swift,gregomni/swift,JGiola/swift,benlangmuir/swift,roambotics/swift,ahoppen/swift,atrick/swift,benlangmuir/swift,apple/swift,JGiola/swift,gregomni/swift,ahoppen/swift,atrick/swift,roambotics/swift,roambotics/swift,ahoppen/swift,apple/swift,rudkx/swift,benlangmuir/swift,ahoppen/swift,roambotics/swift,ahoppen/swift,gregomni/swift,roambotics/swift,benlangmuir/swift,apple/swift,atrick/swift,atrick/swift,glessard/swift,benlangmuir/swift,glessard/swift,glessard/swift,gregomni/swift,rudkx/swift,ahoppen/swift