[clang] [AST] Fix an assertion failure in TypeName::getFullyQualifiedName (PR #159312)

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``````````bash
git-clang-format --diff origin/main HEAD --extensions cpp -- clang/unittests/AST/QualTypeNamesTest.cpp clang/lib/AST/QualTypeNames.cpp
``````````

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View the diff from clang-format here.
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``````````diff
diff --git a/clang/lib/AST/QualTypeNames.cpp b/clang/lib/AST/QualTypeNames.cpp
index b0e9a600f..a2f930911 100644
--- a/clang/lib/AST/QualTypeNames.cpp
+++ b/clang/lib/AST/QualTypeNames.cpp
@@ -58,7 +58,7 @@ static bool getFullyQualifiedTemplateName(const ASTContext &Ctx,
   NestedNameSpecifier NNS = std::nullopt;
 
   TemplateDecl *ArgTDecl = TName.getAsTemplateDecl();
-  if (!ArgTDecl)  // ArgTDecl can be null in dependent contexts.
+  if (!ArgTDecl) // ArgTDecl can be null in dependent contexts.
     return false;
 
   QualifiedTemplateName *QTName = TName.getAsQualifiedTemplateName();
diff --git a/clang/unittests/AST/QualTypeNamesTest.cpp b/clang/unittests/AST/QualTypeNamesTest.cpp
index 71e4c87ce..5b88391c8 100644
--- a/clang/unittests/AST/QualTypeNamesTest.cpp
+++ b/clang/unittests/AST/QualTypeNamesTest.cpp
@@ -48,7 +48,8 @@ TEST(QualTypeNamesTest, TemplateParameters) {
   auto Type = cast<TypeAliasDecl>(TypeLR.front())->getUnderlyingType();
   ASSERT_TRUE(isa<TemplateSpecializationType>(Type));
 
-  EXPECT_EQ(TypeName::getFullyQualifiedName(Type, Ctx, Ctx.getPrintingPolicy()), "T<int>");
+  EXPECT_EQ(TypeName::getFullyQualifiedName(Type, Ctx, Ctx.getPrintingPolicy()),
+            "T<int>");
 }
 
 } // namespace

``````````

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https://github.com/llvm/llvm-project/pull/159312