Distinguish Getter/Setter from general functions · Pull Request !617 · OpenHarmony/arkcompiler_ets_frontend

#### Related issue: 
https://gitee.com/openharmony/arkcompiler_ets_frontend/issues/I5W3HB

#### Description:
We record the flag to distinguish Getter/Setter function from other functions by using the existing place which record accessflag and modifier, since LiteralTag.INTEGER has 32 bit, it won't affect abc size.

#### Test result:
##### 1. Testcase typeinfo result:
##### Testcase:
```
class A {
    n : number;
    constructor(num : number) {
        this.n = num;
    }
    set setNum(num : number) {
        this.n = num;
    }
    get getNum() : number {
        return this.n;
    }
}
```
###### Before vs After:
![输入图片说明](https://foruda.gitee.com/images/1666345237049727241/14f24e35_9731167.png "2022-10-21 17-40-15 的屏幕截图.png")

##### 2. Test262 for ts2abc:
![输入图片说明](https://foruda.gitee.com/images/1666577549660314619/fbb38c37_9731167.png "2022-10-24 10-11-39 的屏幕截图.png")

##### 3. UT test
![输入图片说明](https://foruda.gitee.com/images/1666341317974887010/95276b4f_9731167.png "2022-10-21 16-34-41 的屏幕截图.png")

##### 4. TS type system test
![输入图片说明](https://foruda.gitee.com/images/1666342930504511948/ec3880ca_9731167.png "2022-10-21 17-01-44 的屏幕截图.png")

##### 5. TS type -instruction map test
![输入图片说明](https://foruda.gitee.com/images/1667025212246953517/ac7dde82_9731167.png "2022-10-29 14-33-15 的屏幕截图.png")

类型	指派人员	状态
审查	godmiaozi 已审查通过 hhj	已完成 (1/1人)
测试	openharmony_ci 已测试通过	已完成 (1/1人)

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