Fix a bug with demangling reference storage that I just introduced.

Somehow this only broke tests on the 5.0 branch.

Author: rjmccall

stdlib/public/runtime/Private.h

@@ -63,7 +63,7 @@ class TypeInfo {
     : Response{nullptr, MetadataState::Abstract}, ReferenceOwnership() {}
 
   TypeInfo(MetadataResponse response, TypeReferenceOwnership ownership)
-    : Response(response), ReferenceOwnership() {}
+    : Response(response), ReferenceOwnership(ownership) {}
 
   // FIXME: remove this constructor and require a response in all cases.
   TypeInfo(const Metadata *type, TypeReferenceOwnership ownership)