PPC: [fullcode][mips][mips64][ppc][s390] Avoid trashing of a home object when doing a keyed store to a super.

Port 43aee033

    Fixed minor typo in ppc file.

R=ishell@chromium.org, joransiu@ca.ibm.com, jyan@ca.ibm.com, michael_dawson@ca.ibm.com, mbrandy@us.ibm.com

BUG=chromium:625590
LOG=N

Review-Url: https://codereview.chromium.org/2125933002
Cr-Commit-Position: refs/heads/master@{#37562}