Insert dynamic when type arguments are omitted from redirecting factory.
Insert dynamic when type arguments are omitted from redirecting factory.

BUG=
R=kmillikin@google.com

Review URL: https://chromereviews.googleplex.com/500317013 .

Committed: https://github.com/dart-lang/kernel/commit/9d9d61ec4649b159ed3bbe1c2a486d98e7bf07ea

dart-lang/kernel,dart-archive/kernel