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[Pipeliner] Use the Index from Topo instead of relying on NodeNum. (NFC)

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[Pipeliner] Use the Index from Topo instead of relying on NodeNum. (NFC)

In future, if we may add any new DAG mutations other than artificial dependencies,
the NodeNum may not be valid. Instead the index from topological schedule DAG can be
used as long as we update it with the DAG change.

Differential Revision: https://reviews.llvm.org/D53104

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