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

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yronglin wrote:

Thanks for your review!

> Can we simplify further by lexing the partition along with the module name, when there is one?

Let me give a try, We may need to move the logic in Parser to Lex stage.

> We could also have a ModuleNameInfo::toString() function we could use in a couple places.

Sure, But it may only be useful for C++20 Modules. Modules in Objective-C and other languages ​​need to be separated by '.'.

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