[clang] [clang] [modules] Add err_main_in_named_module (PR #146635)

[Chuanqi Xu via cfe-commits]

================
@@ -12486,6 +12486,14 @@ void Sema::CheckMain(FunctionDecl *FD, const DeclSpec 
&DS) {
                                 : FixItHint());
       FD->setInvalidDecl(true);
     }
+
+    // In C++ [basic.start.main]p3, it is said a program attaching main to a
+    // named module is ill-formed.
----------------
ChuanqiXu9 wrote:

nit: generally we we'll cite it directly:

```suggestion
    // [basic.start.main]p3:
    //
    //       ....
```

https://github.com/llvm/llvm-project/pull/146635
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