[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]

https://github.com/ChuanqiXu9 milestoned 
https://github.com/llvm/llvm-project/pull/99300
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