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Temporarily Revert "[gicombiner] Add the MatchDag structure and parse…

Authored by echristo on Dec 17 2019, 4:22 PM.

Description

Temporarily Revert "[gicombiner] Add the MatchDag structure and parse instruction DAG's from the input" and follow-on patches.

This is breaking a few build bots and local builds with follow-up already
on the patch thread.

This reverts commits 390c8baa5440dda8907688d9ef860f6982bd925f and
520e3d66e7257c77f1226185504bbe1cb90afcfa.