This way we can ship \u{..} escapes in strings / identifiers before shipping /u regexps. BUG= Review URL: https://codereview.chromium.org/903703002 Cr-Commit-Position: refs/heads/master@{#26461}
Allows \u{xxxxx} in regexps. Behind the --harmony-unicode flag. Part 1 is here: https://codereview.chromium.org/716423002 BUG=v8:3648 LOG=N Review URL: https://codereview.chromium.org/788043005 Cr-Commit-Position: refs/heads/master@{#26018}