code: public static InsnList pop(int count) {
          Validate.isTrue(count >= 0);
          InsnList ret = new InsnList();
          for (int i = 0; i < count; i++) {
              ret.add(new InsnNode(Opcodes.POP));
          }
  
          return ret;
      }
docs: Generates instructions to pop {@code count} items off the stack.
  @param count number of items to pop
  @return instructions for a pop
  @throws IllegalArgumentException if any numeric argument is negative