[clang] [clang] Be const-correct with all uses of `Module *`. (PR #93493)

[Chuanqi Xu via cfe-commits]

https://github.com/ChuanqiXu9 approved this pull request.

I feel good with this too. 

But if later you have similar multiple consecutive large NFC patches like this, I'll recommend you send the PR as stacked PR and then we can land the continuously. It'll help the downstream project slightly.

https://github.com/llvm/llvm-project/pull/93493