Re: [PATCH v2 0/6] MR9403: vccorlib140: Implement stringification functions.

[Vibhav Pant (＠vibhavp)]

v2:
* Simplify `tostring_impl`.
* Reuse `_ToString()` functions in `__abi_ObjectToString`.
* Rewrite `HSTRING_SPRINTF` as a function.

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https://gitlab.winehq.org/wine/wine/-/merge_requests/9403#note_121354