Moved copy_constructing into functions and destructing the results into obj_lower. Removed all defer_stack from c_generator. The last thing should be to move ref handling into obj_lower or maybe a pass after, then the rest of c_generator can be cleaned up and fixing interpreter (except for closures) should be easy.

tests/test_util.expected_results

@@ -24,10 +24,10 @@ destruct with 101
 destruct with 1
 copy construct from 3 to 4
 copy construct from 103 to 104
-destruct with 3
-destruct with 103
 done
 destruct with 4
 destruct with 104
+destruct with 3
+destruct with 103
 destruct with 100
 destruct with 0