PPC/s390: [es2015] Simplify contract between parser and stub for derived constructors.
Port 776d89f9 Original Commit Message: Rewrite returns in derived constructors to only replace undefined with this, and otherwise just return the value, and let the construct stub builtin throw an exception if the result is a primitive instead of a JSReceiver. R=bmeurer@chromium.org, joransiu@ca.ibm.com, jyan@ca.ibm.com, michael_dawson@ca.ibm.com BUG=chromium:706642 LOG=N Review-Url: https://codereview.chromium.org/2786413003 Cr-Commit-Position: refs/heads/master@{#44315}
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