PPC: Fix HArrayBufferNotNeutered instruction

Fix faulty condition register usage after andi.

BUG=
R=dstence@us.ibm.com, michael_dawson@ca.ibm.com, jochen@chromium.org, bmeurer@chromium.org

Review URL: https://codereview.chromium.org/1108363002

Cr-Commit-Position: refs/heads/master@{#28116}