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Define a "Version" class in kernel that allows easy comparison between versions (e.g. a < b, a >= b etc). Use this Version class in CFE. Change-Id: I2f382e7bb3c2083258743b9b66a909a88d575dbc Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/144283 Reviewed-by: Johnni Winther <johnniwinther@google.com> Commit-Queue: Jens Johansen <jensj@google.com>