We don't need the hole check and slow runtime mode for read-only properties this way. R=ishell@chromium.org Review URL: https://codereview.chromium.org/1255133002 Cr-Commit-Position: refs/heads/master@{#29881}
Review URL: https://codereview.chromium.org/1259853002 Cr-Commit-Position: refs/heads/master@{#29860}