PPC: Ensure object literal element boilerplates aren't modified.

PPC: Ensure object literal element boilerplates aren't modified.

Port 7c347c545e33d279b5aa476e754a5358201be846

Original commit message:
A bug allows JSObject literals with elements to have the elements in the
boilerplate modified.

R=mbrandy@us.ibm.com

BUG=466993
LOG=N

Committed: https://crrev.com/4922412a72ab41f53efcaf0ae24f8f6cc14f1d8a
Cr-Commit-Position: refs/heads/master@{#27552}

[michael_dawson, 2015-03-31 17:51:38]

Next PPC patch

[MTBrandyberry, 2015-03-31 17:53:17]

On 2015/03/31 17:51:38, michael_dawson wrote:
> Next PPC patch

lgtm

[michael_dawson, 2015-03-31 17:54:58]

The CQ bit was checked by michael_dawson@ca.ibm.com

[commit-bot: I haz the power, 2015-03-31 17:55:07]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1046223002/1

[commit-bot: I haz the power, 2015-03-31 18:30:26]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-03-31 18:30:34]

Patchset 1 (id:??) landed as
https://crrev.com/4922412a72ab41f53efcaf0ae24f8f6cc14f1d8a
Cr-Commit-Position: refs/heads/master@{#27552}