Fix incorrect static index in class literal buffer · Pull Request !418 · OpenHarmony/arkcompiler_ets_frontend

Fix incorrect static index in class literal buffer.

Example:

```
class Context {
    constructor(obj) {
        this.__context_impl__ = obj
        this.__context_impl__.eventHub = new EventHub()
    }

createBundleContext(bundleName) {
        return this.__context_impl__.createBundleContext(bundleName)
    }

createModuleContext(moduleName) {
        return this.__context_impl__.createModuleContext(moduleName)
    }

createModuleContext(bundleName, moduleName) {
        return this.__context_impl__.createModuleContext(bundleName, moduleName)
    }

getApplicationContext() {
        return this.__context_impl__.getApplicationContext()
    }

set area(mode) {
        return this.__context_impl__.switchArea(mode)
    }

get area() {
        return this.__context_impl__.getArea()
    }

get resourceManager() {
        return this.__context_impl__.resourceManager
    }

get applicationInfo() {
        return this.__context_impl__.applicationInfo
    }

get cacheDir() {
        return this.__context_impl__.cacheDir
    }

get tempDir() {
        return this.__context_impl__.tempDir
    }

get filesDir() {
        return this.__context_impl__.filesDir
    }

get distributedFilesDir() {
        return this.__context_impl__.distributedFilesDir
    }

get databaseDir() {
        return this.__context_impl__.databaseDir
    }

get preferencesDir() {
        return this.__context_impl__.preferencesDir
    }

get bundleCodeDir() {
        return this.__context_impl__.bundleCodeDir
    }

get eventHub() {
        return this.__context_impl__.eventHub
    }

get stageMode() {
        return true;
    }
}
```

In the above example, methods with same names are declared in the class body, the calculation of the first index of static property in literal buffer is incorrect, this commit fix this bug.

Corresponding Issue:
https://gitee.com/openharmony/arkcompiler_ets_frontend/issues/I5L025

Test262 Result:
![输入图片说明](https://foruda.gitee.com/images/1659768497660188041/屏幕截图.png "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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