[llvm] [LLVM] Add option to store Parent-pointer in ilist_node_base (PR #94224)

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git-clang-format --diff b2bd024384b484647da9fd9863bf6f77b5731949 537c8f80bfed595ca3f061a2d53b5a8f5ce7802e -- llvm/include/llvm/ADT/ilist_base.h llvm/include/llvm/ADT/ilist_iterator.h llvm/include/llvm/ADT/ilist_node.h llvm/include/llvm/ADT/ilist_node_base.h llvm/include/llvm/ADT/ilist_node_options.h llvm/include/llvm/IR/BasicBlock.h llvm/include/llvm/IR/Instruction.h llvm/include/llvm/IR/ValueSymbolTable.h llvm/lib/IR/BasicBlock.cpp llvm/lib/IR/Instruction.cpp
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View the diff from clang-format here.
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diff --git a/llvm/include/llvm/ADT/ilist_node_options.h b/llvm/include/llvm/ADT/ilist_node_options.h
index aa32162cd5..07820eedb4 100644
--- a/llvm/include/llvm/ADT/ilist_node_options.h
+++ b/llvm/include/llvm/ADT/ilist_node_options.h
@@ -138,7 +138,9 @@ struct extract_parent<ilist_parent<ParentTy>, Options...> {
 };
 template <class Option1, class... Options>
 struct extract_parent<Option1, Options...> : extract_parent<Options...> {};
-template <> struct extract_parent<> { typedef void type; };
+template <> struct extract_parent<> {
+  typedef void type;
+};
 template <class ParentTy>
 struct is_valid_option<ilist_parent<ParentTy>> : std::true_type {};
 

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https://github.com/llvm/llvm-project/pull/94224