5059d9e842
This allows for creating internal pattern nodes in the CFE. Change-Id: Ifad3c29eb7dd329ecd902c7b43fcff58ad862bcc Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/508000 Commit-Queue: Johnni Winther <johnniwinther@google.com> Reviewed-by: Chloe Stefantsova <cstefantsova@google.com>