Add a new flag to assist in landing optimization update.

Add a new flag to assist in landing optimization update.

This is as described in the new comment to assist in updating V8 so https://codereview.chromium.org/1324623005/ can be landed.

TBR=dpranke

Committed: https://crrev.com/e6df1a1f0cdebf68c08e912c15f1575555e08392
Cr-Commit-Position: refs/heads/master@{#348193}

[brettw, 2015-09-10 17:47:48]

The CQ bit was checked by brettw@chromium.org

[commit-bot: I haz the power, 2015-09-10 17:48:03]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1330423002/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1330423002/1

[commit-bot: I haz the power, 2015-09-10 18:23:26]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-09-10 18:25:30]

Patchset 1 (id:??) landed as
https://crrev.com/e6df1a1f0cdebf68c08e912c15f1575555e08392
Cr-Commit-Position: refs/heads/master@{#348193}

[Dirk Pranke, 2015-09-10 18:38:51]

dpranke@chromium.org changed reviewers:
+ dpranke@chromium.org

[Dirk Pranke, 2015-09-10 18:38:52]

lgtm

[commit-bot: I haz the power, 2015-09-23 12:12:22]

Patchset 1 (id:??) landed as
https://crrev.com/e6df1a1f0cdebf68c08e912c15f1575555e08392
Cr-Commit-Position: refs/heads/master@{#348193}