Revert "Revert "Update aosp/master libcxx rebase to r263688""

This reverts commit 1d4a1edbc7.

Change-Id: I2909937fe582f2c5552bc86e7f4d2d5cff0de0aa

test/std/containers/sequences/array/array.cons/initializer_list.pass.cpp

@@ -14,7 +14,9 @@
 #include <array>
 #include <cassert>
 
-#include "../suppress_array_warnings.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"
 
 int main()
 {
@@ -33,4 +35,18 @@ int main()
         C c = {};
         assert(c.size() == 0);
     }
+
+    {
+        typedef double T;
+        typedef std::array<T, 3> C;
+        C c = {1};
+        assert(c.size() == 3.0);
+        assert(c[0] == 1);
+    }
+    {
+        typedef int T;
+        typedef std::array<T, 1> C;
+        C c = {};
+        assert(c.size() == 1);
+    }
 }