[vm] Repair the resolver abstraction, take 2. - Move resolution logic that accumulated in the runtime entries into Resolver. - Improve NoSuchMethodError for closures when --no-lazy-dispatchers - Fix concurrent modification of Null class by nullability propagation. Change-Id: Ib05b431a289d847785032dda46e1bbcb524b7343 Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/98428 Commit-Queue: Ryan Macnak <rmacnak@google.com> Reviewed-by: Régis Crelier <regis@google.com>
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