tree 908250b595e0224b18ddf9bc1df4e0822269c9ff
parent 9c62632f492a49724900824b37f1aa63811fc4cb
author Dan Rubel <danrubel@google.com> 1561135817 +0000
committer commit-bot@chromium.org <commit-bot@chromium.org> 1561135817 +0000

add migration engine support for imported top level var references

In addition to adding imported top level var references support,
this revert GraphBuilder._checkAssignment changes so that the method
conforms to team expectations and addresses comments in
https://dart-review.googlesource.com/c/sdk/+/106562

Change-Id: I3e2b021ec51a1363706a7f6811807d0e6a680df5
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/106920
Reviewed-by: Paul Berry <paulberry@google.com>
Reviewed-by: Brian Wilkerson <brianwilkerson@google.com>