Merge to upstream r225300.

Change-Id: I2b23715db9ac129ff80aa78ad5824db0a4d6fbb3

test/std/numerics/complex.number/complex.ops/stream_output.pass.cpp

@@ -0,0 +1,26 @@
+//===----------------------------------------------------------------------===//
+//
+//                     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.
+//
+//===----------------------------------------------------------------------===//
+
+// <complex>
+
+// template<class T, class charT, class traits>
+//   basic_ostream<charT, traits>&
+//   operator<<(basic_ostream<charT, traits>& o, const complex<T>& x);
+
+#include <complex>
+#include <sstream>
+#include <cassert>
+
+int main()
+{
+    std::complex<double> c(1, 2);
+    std::ostringstream os;
+    os << c;
+    assert(os.str() == "(1,2)");
+}