升级到4.0.0-beta1之后解析时间成倍延长，控制台打印很多数据

项目升级到swift4之后更新pod库到4.0.0-beta1，之后解析时间会成倍增长，控制台疯狂输出：
打印如下：
implicit Objective-C entrypoint -[lxd.RequestAllMallOrders_ReqMOD pageSize] is deprecated and will be removed in Swift 4; add explicit '@objc' to the declaration to emit the Objective-C entrypoint in Swift 4 and suppress this message
、Current stack trace:
0 libswiftCore.dylib 0x000000010250cf50 swift::warning(unsigned int, char const*, ...) + 132
1 libswiftCore.dylib 0x000000010253be54 swift_objc_swift3ImplicitObjCEntrypoint + 452
2 lxd 0x0000000100532b2c @objc SwiftBaseModel.errorCodeMsg.getter + 76
3 Foundation 0x0000000191fcd538 + 264
4 HandyJSON 0x0000000101e75c8c static _ExtendCustomModelType._serializeModelObject(instance:properties:mapper:) + 1400
5 HandyJSON 0x0000000101e74b00 static _ExtendCustomModelType._serializeAny(object:) + 2232
6 HandyJSON 0x0000000101e94ae4 HandyJSON.toJSON() + 136
7 lxd 0x00000001004c952c static Swift_API.queryAllOrderList(parameter:completedClosure:) + 128
8 lxd 0x00000001004c9ac0 @objc static Swift_API.queryAllOrderList(parameter:completedClosure:) + 156
9 lxd 0x00000001005d4518 MyOrderPage.queryOrderList(type:) + 904
10 lxd 0x00000001005d2d24 MyOrderPage.allAction(_:) + 224
11 lxd 0x00000001005d3f74 MyOrderPage.viewDidLoad() + 520
12 lxd 0x00000001005d4424 @objc MyOrderPage.viewDidLoad() + 40
13 UIKit 0x0000000197a6e48c + 148
14 UIKit 0x0000000197c0efc4 + 2136
15 UIKit 0x0000000197c117f8 + 224
16 lxd 0x00000001004d31a0 MyCenterVC_swift.tableView(_:didSelectRowAt:) + 2472
17 lxd 0x00000001004d46a4 @objc MyCenterVC_swift.tableView(_:didSelectRowAt:) + 148
18 UIKit 0x00000001978335ec + 1200
19 UIKit 0x00000001978e3714 + 268
20 UIKit 0x0000000197995470 + 292
21 UIKit 0x0000000197987420 + 528
22 UIKit 0x00000001976fb208 + 132
23 CoreFoundation 0x0000000191584988 + 32
24 CoreFoundation 0x00000001915824bc + 372
25 CoreFoundation 0x00000001915826c0 + 956
26 CoreFoundation 0x00000001914b2bfc CFRunLoopRunSpecific + 424
27 GraphicsServices 0x0000000192f1d010 GSEventRunModal + 100
28 UIKit 0x000000019776dbcc UIApplicationMain + 208
29 lxd 0x00000001004492cc main + 124
30 libdyld.dylib 0x00000001904c1598 + 4、

Reproduce the slowdown after updating the pod to 4.0.0-beta1 and Swift 4, then start with HandyJSON.toJSON() and _ExtendCustomModelType._serializeModelObject in the reported stack trace. Check how the implicit Objective-C entrypoint warning is triggered during serialization; done means parsing returns to its prior speed without repeated console warnings.

Written by the indexing model from the issue text.