741bb5ec4e
This is a follow-up to https://dart-review.googlesource.com/c/sdk/+/169080 mostly changing the library nnbd bit encoding so that weak is uniquely represented as "00" which is the default when nothing else is set. Change-Id: I1cd31e8c1927fee29d579772fb6893cb28befbf1 Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/169200 Commit-Queue: Jens Johansen <jensj@google.com> Reviewed-by: Johnni Winther <johnniwinther@google.com>