[clang] [lldb] [clang][AST] fix ast-print of extern with >=2 declarators, fixed (PR #93913)

[Aaron Ballman via cfe-commits]

================
@@ -576,13 +576,19 @@ template <typename T> static bool 
isFirstInExternCContext(T *D) {
   return First->isInExternCContext();
 }
 
-static bool isSingleLineLanguageLinkage(const Decl &D) {
-  if (const auto *SD = dyn_cast<LinkageSpecDecl>(D.getDeclContext()))
+static bool isUnbracedLanguageLinkage(const DeclContext *DC) {
+  if (!DC)
+    return false;
+  if (const auto *SD = dyn_cast<LinkageSpecDecl>(DC))
     if (!SD->hasBraces())
       return true;
----------------
AaronBallman wrote:

```suggestion
    return !SD->hasBraces();
```

https://github.com/llvm/llvm-project/pull/93913
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