* This allows to get from a Call to the called irg.
*/
FIRM_API ir_graph *get_entity_irg(const ir_entity *ent);
-FIRM_API void set_entity_irg(ir_entity *ent, ir_graph *irg);
/** A reserved value for "not yet set". */
#define IR_VTABLE_NUM_NOT_SET ((unsigned)(-1))