Revert "Update aosp/master libcxx rebase to r263688"

The world is burning.

This reverts commit c004fd909c, reversing
changes made to 1418e4163d.

test/std/containers/sequences/array/array.special/swap.pass.cpp

@@ -14,27 +14,7 @@
 #include <array>
 #include <cassert>
 
-#include "test_macros.h"
-// std::array is explicitly allowed to be initialized with A a = { init-list };.
-// Disable the missing braces warning for this reason.
-#include "disable_missing_braces_warning.h"
-
-struct NonSwappable {
-  NonSwappable() {}
-private:
-  NonSwappable(NonSwappable const&);
-  NonSwappable& operator=(NonSwappable const&);
-};
-
-template <class Tp>
-decltype(swap(std::declval<Tp>(), std::declval<Tp>()))
-can_swap_imp(int);
-
-template <class Tp>
-std::false_type can_swap_imp(...);
-
-template <class Tp>
-struct can_swap : std::is_same<decltype(can_swap_imp<Tp>(0)), void> {};
+#include "../suppress_array_warnings.h"
 
 int main()
 {
@@ -62,24 +42,4 @@ int main()
         assert(c1.size() == 0);
         assert(c2.size() == 0);
     }
-    {
-        typedef NonSwappable T;
-        typedef std::array<T, 0> C0;
-        static_assert(can_swap<C0&>::value, "");
-        C0 l = {};
-        C0 r = {};
-        swap(l, r);
-#if TEST_STD_VER >= 11
-        static_assert(noexcept(swap(l, r)), "");
-#endif
-    }
-#if TEST_STD_VER >= 11
-    {
-        // NonSwappable is still considered swappable in C++03 because there
-        // is no access control SFINAE.
-        typedef NonSwappable T;
-        typedef std::array<T, 42> C1;
-        static_assert(!can_swap<C1&>::value, "");
-    }
-#endif
 }