This splits ConstantVisitor(1) into a pure interface and a
ConstantVisitor(1)DefaultMixin with the base implementation. This is
a step towards avoid having an accidental default implementation where
a static error would have been preferable.
Also removes BodyVisitor1 which was unused.
TEST=existing
Change-Id: I265754e13e0ebcce5c154b16c7ee36854f4ce9fe
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/325400
Reviewed-by: Alexander Markov <alexmarkov@google.com>
Reviewed-by: Mayank Patke <fishythefish@google.com>
Reviewed-by: Ömer Ağacan <omersa@google.com>
Reviewed-by: Jens Johansen <jensj@google.com>
Commit-Queue: Johnni Winther <johnniwinther@google.com>
Johnni Winther
36b93f6b08