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

[Chuanqi Xu via cfe-commits]

ChuanqiXu9 wrote:

BTW, for the series patches, it may be better to use stacked PR (we use stacked PR by the method in https://llvm.org/docs/GitHub.html) if you have following patches (and it looks like you have a lot).

Also, as a downstream vendor, I hope we can land the (large, NFC) patch series together. Since it shows some pains in backporting such patch series.

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