[co19] Roll co19 to 055b5c984613ec1b8ef76516db3ea99fee63acb9
[co19] Roll co19 to 055b5c984613ec1b8ef76516db3ea99fee63acb9

2021-05-04 sgrekhov@unipro.ru 993. Fix expected size of the packed struct
2021-04-27 irina.arkhipets@gmail.com Issue 1083: Missing Issue tag added.
2021-04-27 irina.arkhipets@gmail.com Fixes 1084: test expectation corrected for null safety turned on.
2021-04-27 irina.arkhipets@gmail.com Issue 996: More tests for Generic functions as type parameter or bound added, missing shared options added

Cq-Include-Trybots: dart/try:analyzer-nnbd-linux-release-try,analyzer-nnbd-mac-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-simarm64-try,vm-kernel-nnbd-linux-release-x64-try,vm-kernel-precomp-nnbd-linux-release-x64-try
Change-Id: I809761fb0c7c14538a7c6935a9c9ded67935f268
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/198020
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