As example StackMapTable:
Old format:
         putstatic Field slist:Ljava/util/List;;
         iconst_0;
         istore_0;
  L14: stack_frame_type append;
         locals_map int;
         iload_0;
         bipush 25;

New Format:
         putstatic Field slist:Ljava/util/List;;
         iconst_0;
         istore_0;
  L14: iload_0;
         bipush 25;

     StackMapTable: number_of_entries = 2
        frame_type = 252 /* append */
          offset_delta = 14
          locals = [ int ]
        frame_type = 250 /* chop */
          offset_delta = 26