I was getting these warnings with Adobe's latest ASC 2.0 compiler. You can fix it like this
Change:
if (allTrue || (tween is SimpleTimeline) || ((isDC = (TweenLite(tween).target == TweenLite(tween).vars.onComplete)) && delayedCalls) || (tweens && !isDC)) {
To:
isDC = (TweenLite(tween).target;
if (allTrue || (tween is SimpleTimeline) || ((isDC == TweenLite(tween).vars.onComplete)) && delayedCalls) || (tweens && !isDC)) {
Chnage:
if ((ar = this._autoRotate)) {
To:
ar = this._autoRotate;
if (ar) {
Change:
if (end != null && (c = (typeof(end) === "number" || end.charAt(1) !== "=") ? Number(end) - start : int(end.charAt(0)+"1") * Number(end.substr(2)))) {
To:
var c:Number = (typeof(end) === "number" || end.charAt(1) !== "=") ? Number(end) - start : int(end.charAt(0)+"1") * Number(end.substr(2));
if (end != null && c) {
Change:
if ((pt._prev = pt2 ? pt2._prev : last)) {
To:
pt._prev = pt2;
if ((pt._prev ? pt2._prev : last)) {
Change:
if ((pt._next = pt2)) {
To:
pt._next = pt2;
if (pt._next) {
Obviously you'll have to reapply these fixes every time you update your Greensock library. Alternatively you can go back to using the old Flex compiler.