[clang] [Clang] Unify interface for accessing template arguments as written for class/variable template specializations (PR #81642)

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``````````bash
git-clang-format --diff f914e8e77c4703814e2f2dcef1d4569b17837c92 01858345a1146f761dec8e5d0a5a36dc0507ec48 -- clang/include/clang/AST/DeclTemplate.h clang/include/clang/AST/RecursiveASTVisitor.h clang/include/clang/ASTMatchers/ASTMatchers.h clang/include/clang/ASTMatchers/ASTMatchersInternal.h clang/lib/AST/ASTImporter.cpp clang/lib/AST/DeclPrinter.cpp clang/lib/AST/DeclTemplate.cpp clang/lib/AST/TypePrinter.cpp clang/lib/Index/IndexDecl.cpp clang/lib/Sema/Sema.cpp clang/lib/Sema/SemaTemplate.cpp clang/lib/Sema/SemaTemplateInstantiateDecl.cpp clang/lib/Serialization/ASTReaderDecl.cpp clang/lib/Serialization/ASTWriterDecl.cpp clang/test/AST/ast-dump-template-decls.cpp clang/test/Index/Core/index-source.cpp clang/test/Index/index-refs.cpp clang/tools/libclang/CIndex.cpp clang/unittests/ASTMatchers/ASTMatchersNodeTest.cpp clang/unittests/ASTMatchers/ASTMatchersTraversalTest.cpp
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View the diff from clang-format here.
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``````````diff
diff --git a/clang/lib/AST/ASTImporter.cpp b/clang/lib/AST/ASTImporter.cpp
index 7bfd54c333..3844cafb5c 100644
--- a/clang/lib/AST/ASTImporter.cpp
+++ b/clang/lib/AST/ASTImporter.cpp
@@ -445,8 +445,7 @@ namespace clang {
         FunctionDecl *FromFD);
 
     template <typename DeclTy>
-    Error ImportTemplateParameterLists(const DeclTy *FromD,
-                                       DeclTy *ToD);
+    Error ImportTemplateParameterLists(const DeclTy *FromD, DeclTy *ToD);
 
     Error ImportTemplateInformation(FunctionDecl *FromFD, FunctionDecl *ToFD);
 
diff --git a/clang/lib/AST/DeclTemplate.cpp b/clang/lib/AST/DeclTemplate.cpp
index f1fb5ba378..adcf9188a9 100644
--- a/clang/lib/AST/DeclTemplate.cpp
+++ b/clang/lib/AST/DeclTemplate.cpp
@@ -987,23 +987,26 @@ ClassTemplateSpecializationDecl::getSpecializedTemplate() const {
 SourceRange
 ClassTemplateSpecializationDecl::getSourceRange() const {
   if (getSpecializationKind() == TSK_ExplicitInstantiationDeclaration) {
-    return SourceRange(getExternLoc(), getTemplateArgsAsWritten()->getRAngleLoc());
+    return SourceRange(getExternLoc(),
+                       getTemplateArgsAsWritten()->getRAngleLoc());
   } else if (getSpecializationKind() == TSK_ExplicitInstantiationDefinition) {
-    return SourceRange(getTemplateKeywordLoc(), getTemplateArgsAsWritten()->getRAngleLoc());
+    return SourceRange(getTemplateKeywordLoc(),
+                       getTemplateArgsAsWritten()->getRAngleLoc());
   } else if (!isExplicitSpecialization()) {
     // No explicit info available.
     llvm::PointerUnion<ClassTemplateDecl *,
                        ClassTemplatePartialSpecializationDecl *>
-      InstFrom = getInstantiatedFrom();
+        InstFrom = getInstantiatedFrom();
     if (InstFrom.isNull())
       return getSpecializedTemplate()->getSourceRange();
     if (const auto *CTD = InstFrom.dyn_cast<ClassTemplateDecl *>())
       return CTD->getSourceRange();
     return InstFrom.get<ClassTemplatePartialSpecializationDecl *>()
-      ->getSourceRange();
+        ->getSourceRange();
   }
   SourceLocation Begin = TagDecl::getOuterLocStart();
-  if (const auto *CTPSD = dyn_cast<ClassTemplatePartialSpecializationDecl>(this)) {
+  if (const auto *CTPSD =
+          dyn_cast<ClassTemplatePartialSpecializationDecl>(this)) {
     if (const auto *InstFrom = CTPSD->getInstantiatedFromMember())
       return InstFrom->getSourceRange();
     else if (!getNumTemplateParameterLists())
@@ -1381,10 +1384,12 @@ SourceRange VarTemplateSpecializationDecl::getSourceRange() const {
   if (isExplicitSpecialization() && !hasInit()) {
     if (const ASTTemplateArgumentListInfo *Info = getTemplateArgsAsWritten())
       return SourceRange(getOuterLocStart(), Info->getRAngleLoc());
-  } else if (getTemplateSpecializationKind() == TSK_ExplicitInstantiationDeclaration ) {
+  } else if (getTemplateSpecializationKind() ==
+             TSK_ExplicitInstantiationDeclaration) {
     if (const ASTTemplateArgumentListInfo *Info = getTemplateArgsAsWritten())
       return SourceRange(getExternLoc(), Info->getRAngleLoc());
-  } else if (getTemplateSpecializationKind() == TSK_ExplicitInstantiationDefinition) {
+  } else if (getTemplateSpecializationKind() ==
+             TSK_ExplicitInstantiationDefinition) {
     if (const ASTTemplateArgumentListInfo *Info = getTemplateArgsAsWritten())
       return SourceRange(getTemplateKeywordLoc(), Info->getRAngleLoc());
   }

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https://github.com/llvm/llvm-project/pull/81642