upgrade enum discriminants

examples/programs/enums/main.bro

@@ -1,9 +1,9 @@
 animals :: import "./animals"
 
 State :: enum(u16) {
-	started = 10
+	started = animals.STATE_STARTED
 	running
-	stopped = 20
+	stopped = animals.STATE_STOPPED
 }
 
 initial State :: State.started
@@ -21,6 +21,9 @@ main func() i32 {
 	values [2]State :: [.started, State.stopped]
 	animal animals.Animal :: animals.Animal.dog
 	if same(state, .running) and
+	   u16(State.started) == 10 and
+	   u16(State.running) == 11 and
+	   u16(State.stopped) == 20 and
 	   values[0] != values[1] and
 	   animal != animals.favorite() and
 	   initial == State.started {