While this may be a useful exercise (and I'd personally like to see some demangler improvements, particularly support for managed references), this sort of broad test doesn't make sense for the Wine test suite, especially if we can't be sure it will always work on Windows. It's the sort of thing you could use to detect problems with our code, which you could then add a few individual tests for.
Maybe it could be added to winezeug? Or is there a more appropriate place?