[clang-tools-extra] [mlir] [libcxx] [clang] [openmp] [llvm] [Clang] Warn against unused parameters in C++ coroutines with `-Wunused-parameters` (PR #70567)

[Wei Wang via llvm-commits]

apolloww wrote:

> Thanks for looking into this. I haven't looked into the details. But I guess it may be a good idea to teach `DiagnoseUnusedParameters` to understand coroutines.

Yeah, I think it could also make user aware of unused parameters so

https://github.com/llvm/llvm-project/pull/70567