[libc++][NFC] Remove duplicate header includes from <algorithm> and reorder them

Remove duplicate header includes from `<algorithm>` and reorder the includes

Reviewed By: Quuxplusone, ldionne, Mordante, #libc, jloser

Spies: jloser, libcxx-commits

Differential Revision: https://reviews.llvm.org/D116507
diff --git a/libcxx/include/algorithm b/libcxx/include/algorithm
index b28c8cd..83bf8df 100644
--- a/libcxx/include/algorithm
+++ b/libcxx/include/algorithm
@@ -645,15 +645,13 @@
 
 */
 
+#include <__bits> // __libcpp_clz
 #include <__config>
 #include <__debug>
-#include <__bits> // __libcpp_clz
 #include <cstddef>
 #include <cstring>
 #include <functional>
 #include <initializer_list>
-#include <utility> // needed to provide swap_ranges.
-#include <memory>
 #include <iterator>
 #include <memory>
 #include <type_traits>