PPC64: Implemented the Word64Clz TurboFan operator.

PPC64: Implemented the Word64Clz TurboFan operator.

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

Committed: https://crrev.com/dba4dfb2b0cbdd3727f13086ca7500e0260c1309
Cr-Commit-Position: refs/heads/master@{#31903}

[MTBrandyberry, 2015-11-09 20:25:45]

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

[commit-bot: I haz the power, 2015-11-09 20:25:56]

Dry run: CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1433733002/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1433733002/1

[michael_dawson, 2015-11-09 20:42:37]

On 2015/11/09 20:25:56, 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/1433733002/1
> View timeline at
>  https://chromium-cq-status.appspot.com/patch-timeline/1433733002/1

lgtm

[commit-bot: I haz the power, 2015-11-09 20:52:18]

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

[commit-bot: I haz the power, 2015-11-09 20:52:18]

Dry run: This issue passed the CQ dry run.

[MTBrandyberry, 2015-11-09 20:54:04]

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

[commit-bot: I haz the power, 2015-11-09 20:54:15]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1433733002/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1433733002/1

[commit-bot: I haz the power, 2015-11-09 20:56:37]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-11-09 20:57:12]

Patchset 1 (id:??) landed as
https://crrev.com/dba4dfb2b0cbdd3727f13086ca7500e0260c1309
Cr-Commit-Position: refs/heads/master@{#31903}