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

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<!--LLVM CODE FORMAT COMMENT: {clang-format}-->


:warning: C/C++ code formatter, clang-format found issues in your code. 
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``````````bash
git-clang-format --diff 2ba08386156ef25913b1bee170d8fe95aaceb234 
ae5225aa51a0a8f79ed134d9d5013d5774d2c04d -- 
clang/test/AST/ast-print-language-linkage.cpp clang/lib/AST/DeclPrinter.cpp
``````````

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<details>
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View the diff from clang-format here.
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``````````diff
diff --git a/clang/lib/AST/DeclPrinter.cpp b/clang/lib/AST/DeclPrinter.cpp
index 60d5074e69..6a78bc01c1 100644
--- a/clang/lib/AST/DeclPrinter.cpp
+++ b/clang/lib/AST/DeclPrinter.cpp
@@ -650,8 +650,10 @@ static void 
maybePrintTagKeywordIfSupressingScopes(PrintingPolicy &Policy,
 ///         - nullptr in any other case
 static const char *tryGetUnbracedLinkageLanguage(const Decl *D) {
   const auto *SD = dyn_cast<LinkageSpecDecl>(D->getDeclContext());
-  if (!SD) return nullptr;
-  if (SD->hasBraces()) return nullptr;
+  if (!SD)
+    return nullptr;
+  if (SD->hasBraces())
+    return nullptr;
   if (SD->getLanguage() == LinkageSpecLanguageIDs::C)
     return "C";
   assert(SD->getLanguage() == LinkageSpecLanguageIDs::CXX &&
@@ -679,7 +681,8 @@ void DeclPrinter::VisitFunctionDecl(FunctionDecl *D) {
   CXXDeductionGuideDecl *GuideDecl = dyn_cast<CXXDeductionGuideDecl>(D);
   if (!Policy.SuppressSpecifiers) {
     if (const char *lang = tryGetUnbracedLinkageLanguage(D)) {
-      assert(D->getStorageClass() == SC_None); // the "extern" specifier is 
implicit
+      assert(D->getStorageClass() ==
+             SC_None); // the "extern" specifier is implicit
       Out << "extern \"" << lang << "\" ";
     }
     switch (D->getStorageClass()) {
@@ -953,7 +956,8 @@ void DeclPrinter::VisitVarDecl(VarDecl *D) {
 
   if (!Policy.SuppressSpecifiers) {
     if (const char *lang = tryGetUnbracedLinkageLanguage(D)) {
-      assert(D->getStorageClass() == SC_None); // the "extern" specifier is 
implicit
+      assert(D->getStorageClass() ==
+             SC_None); // the "extern" specifier is implicit
       Out << "extern \"" << lang << "\" ";
     }
     StorageClass SC = D->getStorageClass();
@@ -1089,7 +1093,7 @@ void 
DeclPrinter::VisitNamespaceAliasDecl(NamespaceAliasDecl *D) {
 void DeclPrinter::VisitEmptyDecl(EmptyDecl *D) {
   prettyPrintAttributes(D);
   if (const char *lang = tryGetUnbracedLinkageLanguage(D))
-      Out << "extern \"" << lang << "\";";
+    Out << "extern \"" << lang << "\";";
 }
 
 void DeclPrinter::VisitCXXRecordDecl(CXXRecordDecl *D) {

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