Revert of Do not remove write barriers for stores of old space references in most recent old space allocation. (patchset #1 id:1 of https://codereview.chromium.org/1478113002/ )

Reason for revert:
Broken canary. Trying to find out root cause.

Original issue's description:
> Do not remove write barriers for stores of old space references in most recent old space allocation.
>
> BUG=chromium:561449
> LOG=n
>
> Committed: https://crrev.com/369778ec55a63ebe51e8fa8497edb5b681069b9b
> Cr-Commit-Position: refs/heads/master@{#32368}

TBR=ulan@chromium.org,bmeurer@chromium.org
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=chromium:561449

Review URL: https://codereview.chromium.org/1482973003

Cr-Commit-Position: refs/heads/master@{#32406}