Add two more exception-handling=off tests

test/throw_exception_nx_test.cpp

@@ -0,0 +1,24 @@
+// Copyright 2019 Peter Dimov
+// Distributed under the Boost Software License, Version 1.0.
+// http://www.boost.org/LICENSE_1_0.txt
+
+#include <boost/throw_exception.hpp>
+#include <cstdlib>
+
+class my_exception: public std::exception {};
+
+int main()
+{
+    boost::throw_exception( my_exception() );
+    return 1;
+}
+
+namespace boost
+{
+
+void throw_exception( std::exception const & )
+{
+    std::exit( 0 );
+}
+
+} // namespace boost