Reorder expressions in a breadth-first order #312
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This is addressing a part of issue #308. The motivation is to help enable software pipelining.
Reorders computed-at expressions so that they are ordered in a breadth-first order. Reordering is done within each individual loop-nest. Further, no reordering across computeAt positions is done for correctness.
Ordering of non-computed-at expressions are not changed. They are in a depth-first order.