PPC: Fix "Implement the function.sent proposal."

PPC: Fix "Implement the function.sent proposal."

StoreP needs a scratch register for unaligned immediate offset.

R=neis@chromium.org, joransiu@ca.ibm.com, jyan@ca.ibm.com, michael_dawson@ca.ibm.com
BUG=v8:4700
LOG=n

Committed: https://crrev.com/ceb2d18d8203b365df269aa87654bdd6350ad42a
Cr-Commit-Position: refs/heads/master@{#33619}

[MTBrandyberry, 2016-01-29 16:26:04]

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

[commit-bot: I haz the power, 2016-01-29 16:26:10]

Dry run: CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1644863005/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1644863005/1

[commit-bot: I haz the power, 2016-01-29 16:51:05]

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

[commit-bot: I haz the power, 2016-01-29 16:51:06]

Dry run: This issue passed the CQ dry run.

[michael_dawson, 2016-01-29 18:10:40]

On 2016/01/29 16:51:06, commit-bot: I haz the power wrote:
> Dry run: This issue passed the CQ dry run.

lgtm

[MTBrandyberry, 2016-01-29 19:29:57]

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

[commit-bot: I haz the power, 2016-01-29 19:30:08]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1644863005/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1644863005/1

[commit-bot: I haz the power, 2016-01-29 19:33:54]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2016-01-29 19:34:41]

Description was changed from

==========
PPC: Fix "Implement the function.sent proposal."

StoreP needs a scratch register for unaligned immediate offset.

R=neis@chromium.org, joransiu@ca.ibm.com, jyan@ca.ibm.com,
michael_dawson@ca.ibm.com
BUG=v8:4700
LOG=n
==========

to

==========
PPC: Fix "Implement the function.sent proposal."

StoreP needs a scratch register for unaligned immediate offset.

R=neis@chromium.org, joransiu@ca.ibm.com, jyan@ca.ibm.com,
michael_dawson@ca.ibm.com
BUG=v8:4700
LOG=n

Committed: https://crrev.com/ceb2d18d8203b365df269aa87654bdd6350ad42a
Cr-Commit-Position: refs/heads/master@{#33619}
==========

[commit-bot: I haz the power, 2016-01-29 19:34:42]

Patchset 1 (id:??) landed as
https://crrev.com/ceb2d18d8203b365df269aa87654bdd6350ad42a
Cr-Commit-Position: refs/heads/master@{#33619}