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This is a step towards improving the semantics of these nodes. TEST=existing Change-Id: I95bdb86790414b38af73e9e932cc228b3c0f1f6e Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/249040 Commit-Queue: Johnni Winther <johnniwinther@google.com> Reviewed-by: Alexander Markov <alexmarkov@google.com> Reviewed-by: Jens Johansen <jensj@google.com> Reviewed-by: Joshua Litt <joshualitt@google.com>