[next] Re-enable test that no longer fails
[next] Re-enable test that no longer fails

This is fixed by e41a9833dc850d5757c000a666cb8876f1e6fd5a
(https://github.com/apple/llvm-project/pull/4801), which properly marks
the decl as demoted.

roambotics/swift,benlangmuir/swift,glessard/swift,benlangmuir/swift,benlangmuir/swift,apple/swift,roambotics/swift,roambotics/swift,apple/swift,roambotics/swift,apple/swift,apple/swift,benlangmuir/swift,glessard/swift,roambotics/swift,apple/swift,glessard/swift,glessard/swift,glessard/swift,benlangmuir/swift,roambotics/swift,apple/swift,benlangmuir/swift,glessard/swift