Mark test with issue number in co19 status file

I think that this bug is the right one, though it seems there is disagreement as to whether you can trust identity of errors/stack traces after rethrow. See: https://codereview.chromium.org/78343002 (Ivans comment) and dartbug.com/18394 that suggests the test is wrong.

R=floitsch@google.com

Review URL: https://codereview.chromium.org//788403005

git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge@42423 260f80e4-7a28-3924-810f-c04153c831b5