64ed4bf664
This includes: * accepting null values like sdk-summary or .packages (which are not used when building kernel for the sdk itself) * allow enabling language experiments * only exclude-non-sources on the non-incremental code path if that's requested Change-Id: I08eeb643676f1f1406f0f3030c341d68179d42a2 Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/103574 Reviewed-by: Nate Bosch <nbosch@google.com>