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

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


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

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changing `origin/main` to the base branch/commit you want to compare against.
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View the diff from clang-format here.
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``````````diff
diff --git a/clang/include/clang/AST/Decl.h b/clang/include/clang/AST/Decl.h
index f79dea97d..d85d04d2a 100644
--- a/clang/include/clang/AST/Decl.h
+++ b/clang/include/clang/AST/Decl.h
@@ -4529,7 +4529,9 @@ public:
   }
 
   field_iterator noload_field_begin() const;
-  field_iterator noload_field_end() const { return field_iterator(decl_iterator()); }
+  field_iterator noload_field_end() const {
+    return field_iterator(decl_iterator());
+  }
 
   // Whether there are any fields (non-static data members) in this record.
   bool noload_field_empty() const {

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