private static VM_HashSet findOrCreateSet(VM_Class I) {
private static synchronized VM_HashSet findOrCreateSet(VM_Class I) {
  private static VM_HashSet findOrCreateSet(VM_Class I) {    VM_HashSet set = (VM_HashSet)interfaceMapping.get(I);    if (set == null) {      set = new VM_HashSet(3);      interfaceMapping.put(I,set);    }    return set;  }