PPC: Implement Popcnt operator.

PPC: Implement Popcnt operator.

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

Committed: https://crrev.com/e07d7028ff8c747fdd42150a0c4d02759fd4cbf6
Cr-Commit-Position: refs/heads/master@{#31346}

[MTBrandyberry, 2015-10-16 17:05:32]

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

[commit-bot: I haz the power, 2015-10-16 17:05:39]

Dry run: CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1409143002/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1409143002/1

[michael_dawson, 2015-10-16 17:21:54]

On 2015/10/16 17:05:39, 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/1409143002/1
> View timeline at
>  https://chromium-cq-status.appspot.com/patch-timeline/1409143002/1

lgtm

[commit-bot: I haz the power, 2015-10-16 17:40:06]

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

[commit-bot: I haz the power, 2015-10-16 17:40:07]

Dry run: This issue passed the CQ dry run.

[MTBrandyberry, 2015-10-16 17:41:12]

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

[commit-bot: I haz the power, 2015-10-16 17:41:16]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1409143002/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1409143002/1

[commit-bot: I haz the power, 2015-10-16 17:42:48]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-10-16 17:43:07]

Patchset 1 (id:??) landed as
https://crrev.com/e07d7028ff8c747fdd42150a0c4d02759fd4cbf6
Cr-Commit-Position: refs/heads/master@{#31346}