Do not emit declare or emit a vtbl entry for bodyless functions in abstract classes. Maybe the better fix would be to adjust FuncDeclaration::isAbstract, but there may be unwelcome sideeffects.

#ifndef LDC_IR_IRDTYPE_H
#define LDC_IR_IRDTYPE_H

#include <set>

namespace llvm {
    class PATypeHolder;
}

struct IrDType
{
    IrDType();
    llvm::PATypeHolder* type;
};

#endif