Add more tests for optional<const T>

llvm-svn: 285384

libcxx/test/std/utilities/optional/optional.object/optional.object.ctor/move.pass.cpp

@@ -136,6 +136,11 @@ int main()
 {
     test<int>();
     test<int>(3);
+    {
+        optional<const int> o(42);
+        optional<const int> o2(std::move(o));
+        assert(*o2 == 42);
+    }
     {
         using T = TestTypes::TestType;
         T::reset();