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

Review URL: https://codereview.chromium.org/1382633002

Cr-Commit-Position: refs/heads/master@{#31026}