Store bools as i8.

I really hope we can refactor this to use a less leaky
abstraction later – it should at least be possible to merge
voidToI8 and i1ToI8.

ir/irtypeclass.cpp

@@ -169,7 +169,7 @@ void IrTypeClass::addBaseClassData(
         }
 
         // add default type
-        defaultTypes.push_back(DtoType(vd->type));
+        defaultTypes.push_back(DtoType(vd->type)); // @@@ i1ToI8?!
 
         // advance offset to right past this field
         offset = vd->offset + vd->type->size();