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[ScheduleDAG] Move `Topo` and `addEdge` to base class.
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Authored by courbet on Mar 22 2019, 3:39 AM.

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Reviewers
andreadb
Summary

Some DAG mutations can only be applied to ScheduleDAGMI, and have to
internally cast a ScheduleDAGInstrs to ScheduleDAGMI.

There is nothing actually specific to ScheduleDAGMI in Topo.

This allows using DAG mutations for other ScheduleDAG implementations (see D59688).