[test] Add support for Objective-C++ tests

Differential revision: https://reviews.llvm.org/D33049

git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@303466 91177308-0d34-0410-b5e6-96231b3b80d8

test/libcxx/selftest/test.pass.mm

@@ -0,0 +1,17 @@
+// -*- C++ -*-
+//===----------------------------------------------------------------------===//
+//
+//                     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.
+//
+//===----------------------------------------------------------------------===//
+
+#if __has_feature(objc_arc)
+#error "arc should *not* be enabled"
+#endif
+
+int main()
+{
+}