PPC: [turbofan] Add Int64(Add|Sub)WithOverflow support.

PPC: [turbofan] Add Int64(Add|Sub)WithOverflow support.

Port bafb568b6e9e70968d9b26f506b1cefe89a6b28a

R=jarin@chromium.org, joransiu@ca.ibm.com, jyan@ca.ibm.com, michael_dawson@ca.ibm.com
BUG=

Committed: https://crrev.com/a9f69934a5edbdb35b5b6440545dfffb74afa588
Cr-Commit-Position: refs/heads/master@{#33063}

[MTBrandyberry, 2015-12-30 14:47:52]

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

[commit-bot: I haz the power, 2015-12-30 14:48:00]

Dry run: CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1552783002/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1552783002/1

[commit-bot: I haz the power, 2015-12-30 15:14:23]

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

[commit-bot: I haz the power, 2015-12-30 15:14:24]

Dry run: This issue passed the CQ dry run.

[JoranSiu, 2015-12-30 16:13:09]

On 2015/12/30 15:14:24, commit-bot: I haz the power wrote:
> Dry run: This issue passed the CQ dry run.

lgtm

[MTBrandyberry, 2015-12-30 16:16:01]

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

[commit-bot: I haz the power, 2015-12-30 16:16:08]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1552783002/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1552783002/1

[commit-bot: I haz the power, 2015-12-30 16:17:46]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-12-30 16:18:11]

Description was changed from

==========
PPC: [turbofan] Add Int64(Add|Sub)WithOverflow support.

Port bafb568b6e9e70968d9b26f506b1cefe89a6b28a

R=jarin@chromium.org, joransiu@ca.ibm.com, jyan@ca.ibm.com,
michael_dawson@ca.ibm.com
BUG=
==========

to

==========
PPC: [turbofan] Add Int64(Add|Sub)WithOverflow support.

Port bafb568b6e9e70968d9b26f506b1cefe89a6b28a

R=jarin@chromium.org, joransiu@ca.ibm.com, jyan@ca.ibm.com,
michael_dawson@ca.ibm.com
BUG=

Committed: https://crrev.com/a9f69934a5edbdb35b5b6440545dfffb74afa588
Cr-Commit-Position: refs/heads/master@{#33063}
==========

[commit-bot: I haz the power, 2015-12-30 16:18:13]

Patchset 1 (id:??) landed as
https://crrev.com/a9f69934a5edbdb35b5b6440545dfffb74afa588
Cr-Commit-Position: refs/heads/master@{#33063}