Merge to upstream r225300.

Change-Id: I2b23715db9ac129ff80aa78ad5824db0a4d6fbb3

test/std/numerics/numarray/valarray.range/begin_const.pass.cpp

@@ -0,0 +1,30 @@
+//===----------------------------------------------------------------------===//
+//
+//                     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;
+
+// template <class T>
+//   unspecified1
+//   begin(const valarray<T>& v);
+
+#include <valarray>
+#include <cassert>
+
+int main()
+{
+    {
+        typedef int T;
+        T a[] = {1, 2, 3, 4, 5};
+        const unsigned N = sizeof(a)/sizeof(a[0]);
+        const std::valarray<T> v(a, N);
+        assert(v[0] == 1);
+    }
+}