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

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+// RUN: %clang_cc1 -std=c++20 -emit-module-interface %s -triple x86_64-linux-gnu -DTEST=1 -verify
+// RUN: %clang_cc1 -std=c++20 -emit-module-interface %s -triple x86_64-linux-gnu -DTEST=2 -verify
+
+module;
+export module x;
+#include "version.h"
+#if TEST == 1
+export module VERSION;  // expected-error {{module declaration cannot be a macro}}
+#endif // TEST == 1
+
+#if TEST == 2
+export module A.B;      // expected-error {{module declaration cannot be a macro}}
+#endif // TEST == 2
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yronglin wrote:

Sure, I'd be happy to do this.

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