- when control flow is changed, invalidate the entity usage state

[r25284]

ir/opt/cfopt.c

@@ -757,6 +757,7 @@ restart:
 		set_irg_doms_inconsistent(irg);
 		set_irg_extblk_inconsistent(irg);
 		set_irg_loopinfo_inconsistent(irg);
+		set_irg_entity_usage_state(irg, ir_entity_usage_not_computed);
 		env.changed = 0;
 	}
 
@@ -856,6 +857,7 @@ restart:
 		set_irg_doms_inconsistent(irg);
 		set_irg_extblk_inconsistent(irg);
 		set_irg_loopinfo_inconsistent(irg);
+		set_irg_entity_usage_state(irg, ir_entity_usage_not_computed);
 	}
 
 

ir/opt/combo.c

@@ -3542,6 +3542,7 @@ void combo(ir_graph *irg) {
 		set_irg_extblk_inconsistent(irg);
 		set_irg_doms_inconsistent(irg);
 		set_irg_loopinfo_inconsistent(irg);
+		set_irg_entity_usage_state(irg, ir_entity_usage_not_computed);
 	}
 
 	ir_free_resources(irg, IR_RESOURCE_IRN_LINK | IR_RESOURCE_PHI_LIST);

ir/opt/condeval.c

@@ -727,6 +727,7 @@ void opt_cond_eval(ir_graph* irg)
 		set_irg_doms_inconsistent(irg);
 		set_irg_extblk_inconsistent(irg);
 		set_irg_loopinfo_inconsistent(irg);
+		set_irg_entity_usage_state(irg, ir_entity_usage_not_computed);
 
 		/* Dead code might be created. Optimize it away as it is dangerous
 		 * to call optimize_df() an dead code. */