[clang] [clang][driver][clang-cl] Fix unused argument warning for `/std:c++20` for precompiled module inputs to `clang-cl` (PR #99300)

[Chuanqi Xu via cfe-commits]

ChuanqiXu9 wrote:

> Just to clarify—you'd like me to open another PR to `release/19.X`? I can do that.

Yes. You can find the automated generated example in https://github.com/llvm/llvm-project/pull/102159

> 
> In fact I'm a little more ambitious because this and #98761 are honestly very simple PRs—I'd like them to be backported as far as Clang 16 (which is when modules support first appeared) if possible.

No, this is not possible. We may never have new releases for 18, 17 and 16 as far as I know.



https://github.com/llvm/llvm-project/pull/99300