[lldb] qobject as base class break base class parsing

Compare attached screenshots of debugging QtMultimedia's `QGstreamerMediaPlayer` on linux

class QGstreamerMediaPlayer : public QObject,
                              public QPlatformMediaPlayer,
                              public QGstreamerBusMessageFilter,
                              public QGstreamerSyncMessageFilter

the gdb parses the base classes as expected. with lldb, i have the following observations:

• QObject and QPlatformMediaPlayer are listed twice
• all base classes have show QObject members (although only the first base class is a QObject, the others are purely virtual base classes)
• QPlatformMediaPlayer has members, but the members don't show up