This extends https://codereview.chromium.org/2728983002 to all of Turbofan, for the same reasons: The machine reducer is unreliable in signalling changed nodes and value numbering is unpredictable if not always re-run on changed nodes. Putting value numbering last in all graph reducers patches this.

BUG=v8:6036
R=mstarzinger@chromium.org

Review-Url: https://codereview.chromium.org/2730753003
Cr-Commit-Position: refs/heads/master@{#43617}