[clang] [C++20][Modules] Fix merging of anonymous members of class templates. (PR #155948)

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``````````bash
git-clang-format --diff origin/main HEAD --extensions cpp,h -- clang/test/Modules/merge-anon-in-template-2.cpp clang/test/Modules/merge-anon-in-template-3.cpp clang/include/clang/AST/DeclTemplate.h clang/lib/AST/DeclTemplate.cpp clang/lib/Sema/SemaTemplateInstantiate.cpp clang/lib/Serialization/ASTReaderDecl.cpp
``````````

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View the diff from clang-format here.
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``````````diff
diff --git a/clang/lib/AST/DeclTemplate.cpp b/clang/lib/AST/DeclTemplate.cpp
index e67b084a1..63b175457 100644
--- a/clang/lib/AST/DeclTemplate.cpp
+++ b/clang/lib/AST/DeclTemplate.cpp
@@ -984,7 +984,7 @@ ClassTemplateSpecializationDecl::ClassTemplateSpecializationDecl(ASTContext &C,
                                                                  Kind DK)
     : CXXRecordDecl(DK, TagTypeKind::Struct, C, nullptr, SourceLocation(),
                     SourceLocation(), nullptr, nullptr),
-      SpecializationKind(TSK_Undeclared), LocalInstantiation(false)  {}
+      SpecializationKind(TSK_Undeclared), LocalInstantiation(false) {}
 
 ClassTemplateSpecializationDecl *ClassTemplateSpecializationDecl::Create(
     ASTContext &Context, TagKind TK, DeclContext *DC, SourceLocation StartLoc,

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https://github.com/llvm/llvm-project/pull/155948