This is in preparation for the addition of --harmony-destructuring-assignment. BUG=v8:811 LOG=n Review URL: https://codereview.chromium.org/1450193002 Cr-Commit-Position: refs/heads/master@{#32098}
R=rossberg@chromium.org BUG=chromium:552302 LOG=n Review URL: https://codereview.chromium.org/1425723004 Cr-Commit-Position: refs/heads/master@{#31890}