[kernel] Re-land assert initializers. This change updates Dart2js and DDC. Thanks to johnniwinther@ for the Dart2js updates. The original revision is in patchset 2. Change-Id: I26db33312f003f88ccccb67b27998ef21a1f667f Reviewed-on: https://dart-review.googlesource.com/25820 Reviewed-by: Johnni Winther <johnniwinther@google.com> Reviewed-by: Kevin Millikin <kmillikin@google.com> Commit-Queue: Samir Jindel <sjindel@google.com>
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