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

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@@ -1671,6 +1671,8 @@ def err_unexpected_module_decl : Error<
   "module declaration can only appear at the top level">;
 def err_module_expected_ident : Error<
   "expected a module name after '%select{module|import}0'">;
+def err_module_decl_cannot_be_macros : Error<
+  "module declaration cannot be a macro">;
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yronglin wrote:

Should we also print the macro spelling text in diagnostic message? And I found that the first letter in other diagnostic message is lower case, should we update `The name of a ...` to `the name of a ...`?

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