docs: public SupertypeQueryResults getSupertypeQueryResults(ClassDescriptor classDescriptor) {
          SupertypeQueryResults supertypeQueryResults = supertypeSetMap.get(classDescriptor);
          if (supertypeQueryResults == null) {
              supertypeQueryResults = computeSupertypes(classDescriptor);
              supertypeSetMap.put(classDescriptor, supertypeQueryResults);
          }
          return supertypeQueryResults;
      }