xo-interpreter2: + report_memory_use() built-in

include/xo/interpreter2/VirtualSchematikaMachine.hpp

@@ -100,6 +100,9 @@ namespace xo {
             /** visit vsm-owned memory pools; call visitor(info) for each **/
             void visit_pools(const MemorySizeVisitor & visitor) const;
 
+            /** install hardwired functions into global {symtab,env} **/
+            void install_core_primitives();
+
             /** begin interactive session. **/
             void begin_interactive_session();
             /** begin batch session **/