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The link methods will contain all operations required to link class hierarchies across library boundaries. Change-Id: Iaa2bc566e17d215fd8bd9a20e6fc668679a2b58c Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/380208 Reviewed-by: Mark Zhou <markzipan@google.com> Reviewed-by: Nate Biggs <natebiggs@google.com> Commit-Queue: Mark Zhou <markzipan@google.com>