Adding a Swift specific fix that goes along with SVN revision 289233 where we may not always have a DeclVendor.
Adding a Swift specific fix that goes along with SVN revision 289233 where we may not always have a DeclVendor.

<rdar://problem/24093343>

apple/swift-lldb,apple/swift-lldb,apple/swift-lldb,apple/swift-lldb,apple/swift-lldb,apple/swift-lldb