Migration: Improve the tracking of type parameter bounds. This CL extends ElementTypeProvider so that it also tracks type parameter bounds. This allows the FixBuilder to reason correctly about the what generic function types will look like after migration, and that in turn prevents it from trying to add unnecessary casts. Change-Id: I3c909a3b5ba14bf9f2aad4e58d0981c1b7b5bdd2 Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/134412 Reviewed-by: Konstantin Shcheglov <scheglov@google.com> Reviewed-by: Mike Fairhurst <mfairhurst@google.com> Commit-Queue: Paul Berry <paulberry@google.com>
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