[clang] [Clang] Implement P3034R1 Module Declarations Shouldn’t be Macros (PR #90574)

[via cfe-commits]

yronglin wrote:

Dose this [note](https://eel.is/c++draft/cpp.module#note-1) have a conflict with P3034R1?
```
[Note 1: Each identifier currently defined as a macro name is replaced by its replacement list of preprocessing tokens. — end note]
```

https://github.com/llvm/llvm-project/pull/90574