[messages] Change analyzerCodes into a list of enums. Changes the representation of analyzer codes in the `Codes` class from a `List<String>` to a `List<AnalyzerCode>`, where `AnalyzerCode` is a generated enum. This has two major benefits: - It allows switch statements acting on analyzer codes to be more efficient, since they don't have to do string comparisons. - It allows unnecessary cases to be safely removed from switch statements acting on analyzer codes, since it is now clear from the type system what possible values an AnalyzerCode can take on. Several unnecessary cases are removed in this CL. Change-Id: I6a6a696463848ece8db2a34fa65ddd5cf0dc8f0c Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/449920 Reviewed-by: Konstantin Shcheglov <scheglov@google.com> Reviewed-by: Johnni Winther <johnniwinther@google.com> Commit-Queue: Paul Berry <paulberry@google.com>
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