c17b2505da
Speed up bot runtime by sharding the test-runs into - for now - a fixed number of shards (4). Change-Id: Id3a256db82a8fd7ed7902766d74c9f790adbc1cb Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/201821 Reviewed-by: Johnni Winther <johnniwinther@google.com> Commit-Queue: Jens Johansen <jensj@google.com>