Version 0.2.9.3

Merge revision 16089, 16091, 16093, 16094, 16096, 16099 to trunk.

Fixes issues with unicode support in dart:io, always archive before
test on dartium trunk builders, and makes sure a constant that was
used before but removed from the graph gets inserted back in the graph
when it's re-used in dart2js.
Review URL: https://codereview.chromium.org//11571005

git-svn-id: http://dart.googlecode.com/svn/trunk@16102 260f80e4-7a28-3924-810f-c04153c831b5
12 files changed