[llvm] [ADT] Introduce Casting function objects (PR #165803)

[Jakub Kuderski via llvm-commits]

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@@ -841,6 +877,22 @@ template <typename... Types>
 inline constexpr detail::IsaAndPresentCheckPredicate<Types...>
     IsaAndPresentPred{};
 
+/// Function objects corresponding to the Cast types defined above.
+template <typename... Types>
+inline constexpr detail::StaticCastFunc<Types...> StaticCastTo{};
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kuhar wrote:

also below

https://github.com/llvm/llvm-project/pull/165803