types2: ensure that the reportCycle has a deterministic output

Author: wingrez

src/cmd/compile/internal/types2/initorder.go

@@ -148,9 +148,6 @@ func findPath(objMap map[Object]*declInfo, from, to Object, seen map[Object]bool
 		return int(o1.order()) - int(o2.order())
 	})
 	for _, d := range deps {
-		if d == to {
-			return []Object{d}
-		}
 		if P := findPath(objMap, d, to, seen); P != nil {
 			return append(P, d)
 		}