[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:

>From the log, it looks like the git crashes instead of conflicts. @tru  would you like to take look.

@sharadhr also if you want to backport this to 19.x, maybe you can try to create a PR to the branch of 19.x branch manually in case the automated cherry-pick doesn't work.

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