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This was developed by rynstrom@google.com as part of the patterns feature proposal. Moving it into _fe_analyzer_shared will allow us to evolve it into the final implementation. Change-Id: I31bd88fd21e1de60205363c7e6f4c405b8e6c2ab Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/244761 Commit-Queue: Paul Berry <paulberry@google.com> Reviewed-by: Brian Wilkerson <brianwilkerson@google.com> Reviewed-by: Bob Nystrom <rnystrom@google.com>