cc14696646
This is a step towards ensuring that ArgumentImpl is always used from the body builder, so that ArgumentsImpl can be fully separated from Arguments. Change-Id: Id76d02543c36448e55b6e878d11a64513dbfde7b Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/448940 Reviewed-by: Erik Ernst <eernst@google.com> Reviewed-by: Chloe Stefantsova <cstefantsova@google.com> Commit-Queue: Johnni Winther <johnniwinther@google.com>