Combiner optimizer does not optimize when limit follow group, foreach

                 Key: PIG-946
             Project: Pig
          Issue Type: Bug
    Affects Versions: 0.3.0
            Reporter: Pradeep Kamath

The following script is combinable but is not optimized:
a = load '/user/pig/tests/data/singlefile/studenttab10k';
b = group a by $1;
c = foreach b generate group, AVG(a.$2);
d = limit c 10;
dump d;

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