[clang] [libcxx] [libc++] Implement LWG3528 (`make_from_tuple` can perform (the equivalent of) a C-style cast) (PR #85263)

[Mark de Wever via cfe-commits]

================
@@ -195,6 +195,34 @@ void test_noexcept() {
     }
 }
 
+namespace LWG3528 {
+template <class _Tp, class _Tuple, class = std::void_t<>>
+struct can_make_from_tuple : std::false_type {};
+template <class _Tp, class _Tuple>
+struct can_make_from_tuple<
+    _Tp,
+    _Tuple,
+    std::void_t<decltype(std::__make_from_tuple_impl<_Tp>(
----------------
mordante wrote:

I'm not too happy with the implementation details. I like to see whether we can 
use SFINAE.

https://github.com/llvm/llvm-project/pull/85263
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