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

[via cfe-commits]

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@@ -932,6 +932,12 @@ def warn_module_conflict : Warning<
   InGroup<ModuleConflict>;
 
 // C++20 modules
+def err_module_decl_cannot_be_macros : Error<
+  "the module name in a module%select{| partition}0 declaration cannot contain "
+  "an object-like macro %1, it's consists of one or more identifiers "
+  "separated by '.'">;
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cor3ntin wrote:

```suggestion
  "an object-like macro %1">;
```

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