Bob Nystrom
d95a368e70
This doesn't include the copious changes in collection_patch.dart because I believe (1) those are quite old and (2) are dart2js specific. The changes here have basically no effect on DDC, but it at least gets us a little better test coverage and reduces noise in the diffs. R=sra@google.com Review URL: https://codereview.chromium.org/1977003002 .