Arrow functions have been enabled by default since the 4.5 branch. Review URL: https://codereview.chromium.org/1373633002 Cr-Commit-Position: refs/heads/master@{#31031}
Kills the kRestParameter bailout/disabled optimization, and fixes lazily parsed arrow functions with rest parameters. Supercedes https://crrev.com/1235153006/ BUG=chromium:508074, v8:2160, v8:2700 LOG=N R=rossberg@chromium.org, adamk@chromium.org, wingo@igalia.com Review URL: https://codereview.chromium.org/1272673003 Cr-Commit-Position: refs/heads/master@{#30550}