Suppress failing test source_span/test/file_test.

BUG=dartbug.com/21533
R=lrn@google.com

Review URL: https://codereview.chromium.org//693393005

git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge@41593 260f80e4-7a28-3924-810f-c04153c831b5
Add test for ConstructorElement.effectiveTarget in the presence of patch classes.

BUG= http://dartbug.com/21132
R=johnniwinther@google.com

Review URL: https://codereview.chromium.org//612033002

git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge@41594 260f80e4-7a28-3924-810f-c04153c831b5
Support parsing of enums in dart2js.

Revived from https://codereview.chromium.org/282453004

BUG=
R=floitsch@google.com

Review URL: https://codereview.chromium.org//698563005

git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge@41595 260f80e4-7a28-3924-810f-c04153c831b5