Optimize flat_list::clear for the case of trivially-destructible types

libs/util/include/psemek/util/flat_list.hpp

@@ -162,6 +162,14 @@ namespace psemek::util
 	template <typename T, typename Handle>
 	void flat_list<T, Handle>::clear()
 	{
+		if constexpr (std::is_trivially_destructible_v<T>)
+		{
+			nodes_.reset();
+			capacity_ = 0;
+			first_ = null;
+			return;
+		}
+
 		if (size_ == 0)
 		{
 			nodes_.reset();