`declare`-ed members not correctly handled by isolatedDeclerations emit

The below code pattern using the `declare` syntax appears to result in members incorrectly being emitted from the produced declarations. 

Example code:
```
declare class Container {
    Data: any;
}

declare class GenericClass {
    public getContainer(): Container;
}

export default GenericClass;
```


[Expected](https://www.typescriptlang.org/play/?#code/CYUwxgNghgTiAEkoGdnwMIHsB2AXKAltiDPAN4BQ818AIlPgFzxTYCeA3BQL4UWhI4iaKngBxEMRgEw6EWko14ABwCuAIwgz4AcxC4seQlIAUASmaH8REl14UQAD2WYYueKABmUVRHcSpGTkUZA4gA):
```
declare class Container {
    Data: any;
}
declare class GenericClass {
    getContainer(): Container;
}
export default GenericClass;

```


Actual
```
export default MyClass;
```


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`declare`-ed members not correctly handled by isolatedDeclerations emit #8473

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Uh oh!

declare-ed members not correctly handled by isolatedDeclerations emit #8473

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`declare`-ed members not correctly handled by isolatedDeclerations emit #8473