PPC: [turbofan] Fix trampoline pool blocking.

PPC: [turbofan] Fix trampoline pool blocking.

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

Committed: https://crrev.com/b237b8a7da4df4221000323938c3adc9ee376a4f
Cr-Commit-Position: refs/heads/master@{#31950}

[MTBrandyberry, 2015-11-11 21:58:53]

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

[commit-bot: I haz the power, 2015-11-11 21:58:59]

Dry run: CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1440813002/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1440813002/1

[michael_dawson, 2015-11-11 22:07:32]

On 2015/11/11 21:58:59, 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/1440813002/1
> View timeline at
>  https://chromium-cq-status.appspot.com/patch-timeline/1440813002/1

lgtm

[commit-bot: I haz the power, 2015-11-11 22:20:07]

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

[commit-bot: I haz the power, 2015-11-11 22:20:09]

Dry run: This issue passed the CQ dry run.

[MTBrandyberry, 2015-11-11 22:20:26]

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

[commit-bot: I haz the power, 2015-11-11 22:20:37]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1440813002/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1440813002/1

[commit-bot: I haz the power, 2015-11-11 22:21:48]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-11-14 23:20:20]

Patchset 1 (id:??) landed as
https://crrev.com/b237b8a7da4df4221000323938c3adc9ee376a4f
Cr-Commit-Position: refs/heads/master@{#31950}