[turbofan] Revive the useful parts of the SimplifiedOperatorReducer.
This partially reverts https://codereview.chromium.org/1162563002 because we might actually be able to optimize certain combinations now due to dead code elimination. R=titzer@chromium.org Review URL: https://codereview.chromium.org/1202263006 Cr-Commit-Position: refs/heads/master@{#29277}
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