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

[via cfe-commits]

yronglin wrote:

The paper does not clearly state whether disallow function-like macro is also needed, but I think disallow function-like macro has the same goal as the paper. WDYT? @cor3ntin @ChuanqiXu9 

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