PPC: [es6] Fix invalid ToString in implementation of ToName.

PPC: [es6] Fix invalid ToString in implementation of ToName.

Port 09626525fea63396c8a200deb9081d6dd1034d57

R=bmeurer@chromium.org, joransiu@ca.ibm.com, jyan@ca.ibm.com, michael_dawson@ca.ibm.com, dstence@us.ibm.com
BUG=

Committed: https://crrev.com/96d6fcffa59b48ef968d4726654ec433953f14aa
Cr-Commit-Position: refs/heads/master@{#31034}

[MTBrandyberry, 2015-09-30 20:28:30]

The CQ bit was checked by mbrandy@us.ibm.com to run a CQ dry run

[commit-bot: I haz the power, 2015-09-30 20:28:39]

Dry run: CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1377133005/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1377133005/1

[michael_dawson, 2015-09-30 20:55:21]

On 2015/09/30 20:28:39, commit-bot: I haz the power wrote:
> Dry run: CQ is trying da patch. Follow status at
>  https://chromium-cq-status.appspot.com/patch-status/1377133005/1
> View timeline at
>  https://chromium-cq-status.appspot.com/patch-timeline/1377133005/1

lgtm.

[commit-bot: I haz the power, 2015-09-30 21:02:48]

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

[commit-bot: I haz the power, 2015-09-30 21:02:49]

Dry run: This issue passed the CQ dry run.

[MTBrandyberry, 2015-09-30 21:07:36]

The CQ bit was checked by mbrandy@us.ibm.com

[commit-bot: I haz the power, 2015-09-30 21:07:51]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1377133005/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1377133005/1

[commit-bot: I haz the power, 2015-09-30 21:09:21]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-09-30 21:09:44]

Patchset 1 (id:??) landed as
https://crrev.com/96d6fcffa59b48ef968d4726654ec433953f14aa
Cr-Commit-Position: refs/heads/master@{#31034}