Merge to upstream r225300.

Change-Id: I2b23715db9ac129ff80aa78ad5824db0a4d6fbb3

test/std/numerics/complex.number/layout.pass.cpp

@@ -0,0 +1,36 @@
+//===----------------------------------------------------------------------===//
+//
+//                     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>
+
+#include <complex>
+#include <cassert>
+
+template <class T>
+void
+test()
+{
+    std::complex<T> z;
+    T* a = (T*)&z;
+    assert(0 == z.real());
+    assert(0 == z.imag());
+    assert(a[0] == z.real());
+    assert(a[1] == z.imag());
+    a[0] = 5;
+    a[1] = 6;
+    assert(a[0] == z.real());
+    assert(a[1] == z.imag());
+}
+
+int main()
+{
+    test<float>();
+    test<double>();
+    test<long double>();
+}