子类同时使用Hotfix 和 LuaCallCSharp标签后，无法在接口里调用父类接口。

[xfilson]

重现如下：修改HotfixTest2.cs

[Hotfix]
[LuaCallCSharp]
public class BaseTest : BaseTestBase
{
public override void Foo(int p)
{
Debug.Log("BaseTest.Foo, p = " + p);
}
}

运行HotfixTest2场景，会报错：
LuaException: [string "Init"]:112: attempt to call a nil value (upvalue 'func')
stack traceback:
[string "Init"]:112: in method 'Foo'
[string "chunk"]:4: in function <[string "chunk"]:2>
XLua.LuaEnv.ThrowExceptionFromError (Int32 oldTop) (at Assets/XLua/Src/LuaEnv.cs:430)
XLua.DelegateBridge.__Gen_Delegate_Imp22 (System.Object p0, Int32 p1) (at Assets/XLua/Gen/DelegatesGensBridge.cs:650)
BaseTest.Foo (Int32 p)
HotfixTest2.Start () (at Assets/XLua/Examples/08_Hotfix/HotfixTest2.cs:382)

[xfilson]

@chexiongsheng