[polly] Fix "no member named 'getIndexExpressionsFromGEP'"

As of 741fabc222f226d34d806056b804244b012853b, polly builders are
failing from this error. The signiature is slightly different and
accepts a ScalarEvolution reference instead. This should fix the polly
builders.

GitOrigin-RevId: 9da62d3ed9d7d8425acbaff13dfe65692db608f9
1 file changed