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=arv@chromium.org,rossberg@chromium.org BUG=v8:811 LOG=N Review URL: https://codereview.chromium.org/1139773005 Cr-Commit-Position: refs/heads/master@{#28457}