[clang] [Modules] Detect ODR mismatches for enums in non-C++ like in C++. (PR #90298)

[Chuanqi Xu via cfe-commits]

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

I have no idea why it was. But the current change looks pretty fine to me.

https://github.com/llvm/llvm-project/pull/90298