[dart2wasm] Refactor _virtualCall arguments Rules out invalid calls with both setter and getter arguments are true in compile time and clarifies that `_virtualCall` handles 3 kinds of instance member access. An assertion added to `Member.referenceAs` extension method to make sure the member is not both a setter and getter. Change-Id: I8e1b0b6fcb9e0d7e47b56ea43f4e452cacc4c69e Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/266624 Reviewed-by: Aske Simon Christensen <askesc@google.com> Reviewed-by: Joshua Litt <joshualitt@google.com> Commit-Queue: Ömer Ağacan <omersa@google.com>
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