We love Shirley MacLaine — and all of her past lives — but she should be ashamed of herself because she and her fellow producers are rearranging the schedule of their new indie flick “Poor Girls” to accomodate the rehab of co-star Lindsay Lohan. How is this deeply troubled young woman, and others like her, going to straighten herself out if Hollywood keeps removing any and all consequences of her mistakes? It wasn’t that long ago that Robert Downey Jr. lost the lead in a Woody Allen movie (as did his proposed co-star Winona Ryder) because the flick’s insurers and studio balked at his reputation. But Downey seems to have learned his lesson, and it turned out the flick, “Anything Else,” was one of the Woodman’s worst.