And change clients of the scanner (within the SDK) to use it.
Long term, it would be better to store the FeatureSet object directly
in the Scanner and remove the existing flags `enableGtGt` and
`enableNonNullable`. However there are analyzer clients that
currently use these flags. So for now, we simply plumb in the
FeatureSet as a new way of setting AstBuilder flags. Once we've
updated clients to use FeatureSet, we'll publish a breaking version of
the analyzer that removes the old flag API.
Change-Id: I9e662f4ed45668d9acd4f56e42d7d8dae6180d48
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/99975
Reviewed-by: Dan Rubel <danrubel@google.com>
Reviewed-by: Konstantin Shcheglov <scheglov@google.com>
Reviewed-by: Brian Wilkerson <brianwilkerson@google.com>
Commit-Queue: Paul Berry <paulberry@google.com>
Paul Berry