bbfe7b02dc
Avoid concurrent modification in dart2js. Avoid crash in VM by not using self-referential type bound. Review URL: https://codereview.chromium.org//12288040 git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge/dart@18667 260f80e4-7a28-3924-810f-c04153c831b5