[llvm] llvm: Export `ilist_node_base` template specialization (PR #168094)

[Kazu Hirata via llvm-commits]

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@@ -67,6 +67,9 @@ class ilist_node_base : public ilist_detail::node_base_prevnext<
                             EnableSentinelTracking>,
                         public ilist_detail::node_base_parent<ParentTy> {};
 
+// Specialization implemented in the core LLVM library.
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kazutakahirata wrote:

I don't think there is real harm in not knowing exactly where the specialization is.

https://github.com/llvm/llvm-project/pull/168094