Merge to upstream r225300.

Change-Id: I2b23715db9ac129ff80aa78ad5824db0a4d6fbb3

test/std/numerics/numarray/template.valarray/valarray.cons/default.pass.cpp

@@ -0,0 +1,37 @@
+//===----------------------------------------------------------------------===//
+//
+//                     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;
+
+// valarray();
+
+#include <valarray>
+#include <cassert>
+
+int main()
+{
+    {
+        std::valarray<int> v;
+        assert(v.size() == 0);
+    }
+    {
+        std::valarray<float> v;
+        assert(v.size() == 0);
+    }
+    {
+        std::valarray<double> v;
+        assert(v.size() == 0);
+    }
+    {
+        std::valarray<std::valarray<double> > v;
+        assert(v.size() == 0);
+    }
+}