code: void addBridges(DiagnosticPosition pos, ClassSymbol origin, ListBuffer<JCTree> bridges) {
          Type st = types.supertype(origin.type);
          while (st.hasTag(CLASS)) {
  //          if (isSpecialization(st))
              addBridges(pos, st.tsym, origin, bridges);
              st = types.supertype(st);
          }
          for (List<Type> l = types.interfaces(origin.type); l.nonEmpty(); l = l.tail)
  //          if (isSpecialization(l.head))
              addBridges(pos, l.head.tsym, origin, bridges);
      }
docs: Add all necessary bridges to some class appending them to list buffer.
  @param pos     The source code position to be used for the bridges.
  @param origin  The class in which the bridges go.
  @param bridges The list buffer to which the bridges are added.