Add test that verifies no temporaries are created by array make_shared

test/Jamfile

@@ -264,3 +264,5 @@ run allocate_local_shared_array_construct_test.cpp ;
 run local_sp_fn_test.cpp ;
 run lsp_convertible_test.cpp ;
 run lsp_convertible_test2.cpp ;
+
+run make_shared_array_tmp_test.cpp ;

test/make_shared_array_tmp_test.cpp

@@ -0,0 +1,43 @@
+//  make_shared_array_tmp_test.cpp
+//
+//  Copyright 2017 Peter Dimov
+//
+//  Distributed under the Boost Software License, Version 1.0.
+//  See accompanying file LICENSE_1_0.txt or copy at
+//  http://www.boost.org/LICENSE_1_0.txt
+
+#include <boost/make_shared.hpp>
+#include <boost/core/lightweight_test.hpp>
+
+struct X
+{
+    static int destroyed;
+
+    ~X()
+    {
+        ++destroyed;
+    }
+};
+
+int X::destroyed = 0;
+
+int main()
+{
+    {
+        X::destroyed = 0;
+
+        boost::make_shared< X[3] >();
+
+        BOOST_TEST_EQ( X::destroyed, 3 );
+    }
+
+    {
+        X::destroyed = 0;
+
+        boost::make_shared< X[] >( 3 );
+
+        BOOST_TEST_EQ( X::destroyed, 3 );
+    }
+
+    return boost::report_errors();
+}