In reducers, we should avoid reductions of the form

  ReduceWithValue(node, replacement)
  return Replace(node)

because such reduction does not kill the original node, so it may
become subject to resurrection from some side table (in the bug
referenced below it was load elimination's side table). Instead,
we should use

  ReduceWithValue(node, replacement)
  return Replace(replacement)

Bug: chromium:945644
Change-Id: Id210efe0d214a53241392d30b7f0eee8e7515e2a
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1545229Reviewed-by: Sigurd Schneider <sigurds@chromium.org>
Commit-Queue: Jaroslav Sevcik <jarin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#60517}