0a80eaec06
This enables the irregexp backend by reverting commit http://code.google.com/p/dart/source/detail?r=42246 R=fschneider@google.com BUG= Review URL: https://codereview.chromium.org//800453003 git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge/dart@42312 260f80e4-7a28-3924-810f-c04153c831b5