[Issue 18881] extern(C++) classes don't work properly in debuginfo

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=18881

--- Comment #2 from Rainer Schuetze <r.sagitario at gmx.de> ---
The __vfptr is now shown, but the derived class is not available because there
is no RTTI for extern(C++) classes.

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