[vm] Cleanup old async/async*/sync* implementation from kernel This change removes kernel transformation which was used to desugar async/async*/sync* functions in the old implementation of async/async*/sync*. The useful part of the transformation is retained in pkg/vm/lib/transformations/for_in_lowering.dart. TEST=ci Issue: https://github.com/dart-lang/sdk/issues/48378 Change-Id: Ic70c1fb35162a31bcc22eac3a8f6488b61e945b4 Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/249944 Reviewed-by: Slava Egorov <vegorov@google.com> Reviewed-by: Johnni Winther <johnniwinther@google.com> Reviewed-by: Martin Kustermann <kustermann@google.com> Commit-Queue: Alexander Markov <alexmarkov@google.com>
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