This makes closed world computation take the static type of the receiver
into account and removes non-live members from the J-world.
Change-Id: I5547aaae4685c6417a94916df0bc4e621296ce8d
Reviewed-on: https://dart-review.googlesource.com/72643
Commit-Queue: Johnni Winther <johnniwinther@google.com>
Reviewed-by: Stephen Adams <sra@google.com>