官方文档还说callmethod指令能提高方法调用速度。亲娘的，这不害死人嘛。这个指令根本不能执行，害我纠结了这么久：
the comments in Verifier.cpp:
OP_callmethod will always throw a verify error. that’s on purpose,
it’s a last minute change before we shipped FP9 and was necessary when we added methods to class Object.
我的亲娘啊，adobe的文档也太扯了。