[co19] Roll co19 to a4f77a02a3676b1c2e7390c860cb0486c8515d3f
[co19] Roll co19 to a4f77a02a3676b1c2e7390c860cb0486c8515d3f

2021-09-03 sgrekhov@unipro.ru Fixes 1187. Roll failures fixed

Cq-Include-Trybots: dart/try:analyzer-nnbd-linux-release-try,dart2js-nnbd-linux-x64-chrome-try,ddc-nnbd-linux-release-chrome-try,front-end-nnbd-linux-release-x64-try,vm-kernel-nnbd-linux-release-x64-try,vm-kernel-precomp-nnbd-linux-release-x64-try
Change-Id: I168b3dff190ea889eba23aad0159a5d130251718
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/212463
Auto-Submit: Alexander Thomas <29642742b6693024c89de8232f2e2542cf7eedf7@google.com>
Commit-Queue: Alexander Thomas <29642742b6693024c89de8232f2e2542cf7eedf7@google.com>
Commit-Queue: William Hesse <a821cddceae7dc400f272e3cb1a72f400f9fed6d@google.com>
Reviewed-by: William Hesse <a821cddceae7dc400f272e3cb1a72f400f9fed6d@google.com>

dart-lang/sdk,dart-lang/sdk,dart-lang/sdk,dart-lang/sdk,dart-lang/sdk,dart-lang/sdk,dart-lang/sdk,dart-lang/sdk