Move test into test/std subdirectory.

git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@224658 91177308-0d34-0410-b5e6-96231b3b80d8

test/std/utilities/time/time.duration/time.duration.cons/convert_exact.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.
+//
+//===----------------------------------------------------------------------===//
+
+// <chrono>
+
+// duration
+
+// template <class Rep2, class Period2>
+//   duration(const duration<Rep2, Period2>& d);
+
+// exact conversions allowed for integral reps
+
+#include <chrono>
+#include <cassert>
+
+int main()
+{
+    {
+    std::chrono::milliseconds ms(1);
+    std::chrono::microseconds us = ms;
+    assert(us.count() == 1000);
+    }
+#ifndef _LIBCPP_HAS_NO_CONSTEXPR
+    {
+    constexpr std::chrono::milliseconds ms(1);
+    constexpr std::chrono::microseconds us = ms;
+    static_assert(us.count() == 1000, "");
+    }
+#endif
+}