PPC: [runtime] Remove weird pushing of something on StackOverflow.

PPC: [runtime] Remove weird pushing of something on StackOverflow.

Port 556b522ac62414c87d05f5d6bab33f6b6cab9b13

Original commit message:
    We somehow try to push some stuff on the stack when we detect a stack
    overflow, that we don't need. Even worse we might access outside the
    valid stack bounds. Since we don't need this, it's gone.

R=bmeurer@chromium.org, joransiu@ca.ibm.com, jyan@ca.ibm.com, michael_dawson@ca.ibm.com, dstence@us.ibm.com
BUG=chromium:534881
LOG=n

Committed: https://crrev.com/aa30d4e29d782d52dcb870e80e7cad71685758ba
Cr-Commit-Position: refs/heads/master@{#31026}

[MTBrandyberry, 2015-09-30 15:31:43]

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

[commit-bot: I haz the power, 2015-09-30 15:31:48]

Dry run: CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1382633002/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1382633002/1

[commit-bot: I haz the power, 2015-09-30 15:55:42]

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

[commit-bot: I haz the power, 2015-09-30 15:55:43]

Dry run: This issue passed the CQ dry run.

[michael_dawson, 2015-09-30 16:21:36]

On 2015/09/30 15:55:43, commit-bot: I haz the power wrote:
> Dry run: This issue passed the CQ dry run.

lgtm

[MTBrandyberry, 2015-09-30 16:26:40]

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

[commit-bot: I haz the power, 2015-09-30 16:26:48]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1382633002/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1382633002/1

[commit-bot: I haz the power, 2015-09-30 16:30:13]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-09-30 16:30:30]

Patchset 1 (id:??) landed as
https://crrev.com/aa30d4e29d782d52dcb870e80e7cad71685758ba
Cr-Commit-Position: refs/heads/master@{#31026}