Regression test for JSRegExp literals sharing.

Regression test for JSRegExp literals sharing.

JSRegExp's properties backing stores must not be shared.

BUG=chromium:548580
LOG=N

Committed: https://crrev.com/37a9be505a4a06f7a7feeda8e83cba239944deb6
Cr-Commit-Position: refs/heads/master@{#31867}

[Igor Sheludko, 2015-11-06 19:44:24]

The CQ bit was checked by ishell@chromium.org to run a CQ dry run

[commit-bot: I haz the power, 2015-11-06 19:44:32]

Dry run: CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1429743006/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1429743006/1

[Igor Sheludko, 2015-11-06 19:44:35]

ishell@chromium.org changed reviewers:
+ yangguo@chromium.org

[Igor Sheludko, 2015-11-06 19:44:35]

PTAL and CQ

[commit-bot: I haz the power, 2015-11-06 20:19:36]

The CQ bit was unchecked by commit-bot@chromium.org

[commit-bot: I haz the power, 2015-11-06 20:19:37]

Dry run: This issue passed the CQ dry run.

[Yang, 2015-11-06 20:44:36]

On 2015/11/06 20:19:37, commit-bot: I haz the power wrote:
> Dry run: This issue passed the CQ dry run.

lgtm.

[Igor Sheludko, 2015-11-07 08:17:50]

The CQ bit was checked by ishell@chromium.org

[commit-bot: I haz the power, 2015-11-07 08:17:56]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1429743006/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1429743006/1

[commit-bot: I haz the power, 2015-11-07 08:19:24]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-11-07 08:19:40]

Patchset 1 (id:??) landed as
https://crrev.com/37a9be505a4a06f7a7feeda8e83cba239944deb6
Cr-Commit-Position: refs/heads/master@{#31867}