[clang] [clang][AST] fix ast-print of `extern ` with >=2 declarators (PR #93131)

[Aaron Ballman via cfe-commits]

================
@@ -1064,6 +1090,8 @@ void 
DeclPrinter::VisitNamespaceAliasDecl(NamespaceAliasDecl *D) {
 
 void DeclPrinter::VisitEmptyDecl(EmptyDecl *D) {
   prettyPrintAttributes(D);
+  if (const char *lang = tryGetUnbracedLinkageLanguage(D))
+    Out << "extern \"" << lang << "\";";
----------------
AaronBallman wrote:

```suggestion
  if (const char *Lang = tryGetUnbracedLinkageLanguage(D))
    Out << "extern \"" << Lang << "\";";
```

https://github.com/llvm/llvm-project/pull/93131
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