Fix syntax error · Pull Request !360 · OpenHarmony/arkcompiler_ets_frontend

Related issue: https://gitee.com/openharmony/arkcompiler_ets_frontend/issues/I5IH42
- Fix syntax error found in test262

**Test262cases:**

```
if (true) class C {}
if (false) ; else class C {}
```

```
if (true) function* g() {  }
if (false) ; else function f() {  }
if (true) async function g() {}
```
If statement:

```
if (true)
    class A {}
    let a=3;
    const a = 4;
```
If Else statement:

```
if (i > 1)
    var a = 2;
else
    class A{}
    let b = 2;
    const c = 4;
```

While statement:

```
while (true)
    class B {};
    let a = 2;
    const b = 4;
```

Declaration name conflicts with built-in global identifier 'undefined':
```
let undefined;
```

before this commit:
![输入图片说明](https://images.gitee.com/uploads/images/2022/0719/212511_843d2bfd_8852068.png "屏幕截图.png")
after this commit:
![输入图片说明](https://images.gitee.com/uploads/images/2022/0719/211411_ad17f137_8852068.png "屏幕截图.png")

- Fix syntax error in break statement
For this case:

```
for (i = 0; i < 5; i++) {
    if (i == 3) {
        break
    }
}
```
![输入图片说明](https://images.gitee.com/uploads/images/2022/0719/210046_a76c4e3e_8852068.png "屏幕截图.png")
===>
generate abc file successfully.

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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