[clang] [Clang] support friend declarations with a dependent nested-name-specifier (PR #191268)

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


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<summary>
You can test this locally with the following command:
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``````````bash
git-clang-format --diff origin/main HEAD --extensions cpp,h -- clang/test/CXX/temp/temp.decls/temp.friend/p6.cpp clang/include/clang/AST/ASTStructuralEquivalence.h clang/include/clang/AST/DeclFriend.h clang/include/clang/AST/DeclTemplate.h clang/include/clang/AST/RecursiveASTVisitor.h clang/include/clang/Sema/Sema.h clang/include/clang/Sema/Template.h clang/lib/AST/ASTImporter.cpp clang/lib/AST/ASTStructuralEquivalence.cpp clang/lib/AST/DeclFriend.cpp clang/lib/AST/DeclPrinter.cpp clang/lib/AST/DeclTemplate.cpp clang/lib/Sema/Sema.cpp clang/lib/Sema/SemaAccess.cpp clang/lib/Sema/SemaDeclCXX.cpp clang/lib/Sema/SemaTemplate.cpp clang/lib/Sema/SemaTemplateDeduction.cpp clang/lib/Sema/SemaTemplateInstantiateDecl.cpp clang/lib/Serialization/ASTReaderDecl.cpp clang/lib/Serialization/ASTWriterDecl.cpp clang/test/CXX/class.access/class.friend/p3-cxx0x.cpp clang/test/CXX/drs/cwg18xx.cpp clang/test/CXX/drs/cwg19xx.cpp clang/test/CXX/drs/cwg28xx.cpp clang/test/CXX/drs/cwg6xx.cpp clang/test/CXX/temp/temp.decls/temp.friend/p5.cpp clang/test/SemaCXX/many-template-parameter-lists.cpp clang/test/SemaTemplate/GH71595.cpp clang/test/SemaTemplate/concepts-friends.cpp clang/test/SemaTemplate/ctad.cpp --diff_from_common_commit
``````````

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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 d9f4ebbe9..b84745382 100644
--- a/clang/lib/AST/DeclPrinter.cpp
+++ b/clang/lib/AST/DeclPrinter.cpp
@@ -890,19 +890,15 @@ void DeclPrinter::VisitFriendDecl(FriendDecl *D) {
   if (TypeSourceInfo *TSI = D->getFriendType()) {
     Out << "friend ";
     Out << TSI->getType().getAsString(Policy);
-  }
-  else if (FunctionDecl *FD =
-      dyn_cast<FunctionDecl>(D->getFriendDecl())) {
+  } else if (FunctionDecl *FD = dyn_cast<FunctionDecl>(D->getFriendDecl())) {
     Out << "friend ";
     VisitFunctionDecl(FD);
-  }
-  else if (FunctionTemplateDecl *FTD =
-           dyn_cast<FunctionTemplateDecl>(D->getFriendDecl())) {
+  } else if (FunctionTemplateDecl *FTD =
+                 dyn_cast<FunctionTemplateDecl>(D->getFriendDecl())) {
     Out << "friend ";
     VisitFunctionTemplateDecl(FTD);
-  }
-  else if (ClassTemplateDecl *CTD =
-           dyn_cast<ClassTemplateDecl>(D->getFriendDecl())) {
+  } else if (ClassTemplateDecl *CTD =
+                 dyn_cast<ClassTemplateDecl>(D->getFriendDecl())) {
     Out << "friend ";
     VisitRedeclarableTemplateDecl(CTD);
   }

``````````

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https://github.com/llvm/llvm-project/pull/191268