PPC: Make KeyedStores from a sloppy arguments array use a handler.
PPC: Make KeyedStores from a sloppy arguments array use a handler.

Port 3a1d7335cf6a623f39c306e0bc0e82ccccc54818

Original commit message:
This finishes up work begun by CL (https://codereview.chromium.org/546683003/) some months ago.

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

Review URL: https://codereview.chromium.org/1160933003

Cr-Commit-Position: 972c6d2dc6dd5efdad1377c0d224e03eb8f276f7@{#28686}

UniversalFuture/moosh,UniversalFuture/moosh,UniversalFuture/moosh,UniversalFuture/moosh