Fix warnings in array and assoc containers

git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@242629 91177308-0d34-0410-b5e6-96231b3b80d8

test/std/containers/sequences/array/front_back.pass.cpp

@@ -17,6 +17,10 @@
 #include <array>
 #include <cassert>
 
+#include "test_macros.h"
+
+#include "suppress_array_warnings.h"
+
 int main()
 {
     {
@@ -45,12 +49,12 @@ int main()
         assert(r2 == 3.5);
     }
 
-#if _LIBCPP_STD_VER > 11 
+#if TEST_STD_VER > 11
     {
         typedef double T;
         typedef std::array<T, 3> C;
         constexpr C c = {1, 2, 3.5};
-        
+
         constexpr T t1 = c.front();
         static_assert (t1 == 1, "");