Merge to upstream r225300.

Change-Id: I2b23715db9ac129ff80aa78ad5824db0a4d6fbb3

test/std/numerics/numarray/template.valarray/valarray.access/access.pass.cpp

@@ -0,0 +1,33 @@
+//===----------------------------------------------------------------------===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is dual licensed under the MIT and the University of Illinois Open
+// Source Licenses. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+
+// <valarray>
+
+// template<class T> class valarray;
+
+// value_type& operator[](size_t i);
+
+#include <valarray>
+#include <cassert>
+
+int main()
+{
+    {
+        typedef int T;
+        T a[] = {5, 4, 3, 2, 1};
+        const unsigned N = sizeof(a)/sizeof(a[0]);
+        std::valarray<T> v(a, N);
+        for (int i = 0; i < N; ++i)
+        {
+            assert(v[i] == a[i]);
+            v[i] = i;
+            assert(v[i] == i);
+        }
+    }
+}