[co19] Roll co19 to 8c5fea8a51cf8c35724ddf136248350bb307d344
[co19] Roll co19 to 8c5fea8a51cf8c35724ddf136248350bb307d344

2021-04-20 irina.arkhipets@gmail.com Fixes 996: new tests for i-2-b and least-and-greatest-closures added.
2021-04-20 sgrekhov@unipro.ru Status files checker. Error processing improved
2021-04-19 sgrekhov@unipro.ru Status files checker. Small updates. Working version
2021-04-16 sgrekhov@unipro.ru Status files checker. Initial commit
2021-04-16 irina.arkhipets@gmail.com Addition for the Issue 534: checked constant variables are moved into main function.
2021-04-16 irina.arkhipets@gmail.com Fixes 1080: comments and more test cases added.
2021-04-15 irina.arkhipets@gmail.com Issue 1080: error in parameter name fixed.
2021-04-15 sgrekhov@unipro.ru Fixed typo which broke the test
2021-04-13 irina.arkhipets@gmail.com Fixes 1077: test corrected
2021-04-13 irina.arkhipets@gmail.com Fixes 1076: test expectation corrected.
2021-04-13 irina.arkhipets@gmail.com Fixes 1075: test expectation corrected.

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-debug-x64-try,vm-kernel-nnbd-linux-release-simarm64-try,vm-kernel-nnbd-linux-release-x64-try,vm-kernel-nnbd-mac-release-x64-try,vm-kernel-nnbd-win-release-x64-try,vm-kernel-precomp-nnbd-linux-debug-x64-try,vm-kernel-precomp-nnbd-linux-release-simarm64-try,vm-kernel-precomp-nnbd-linux-release-x64-try
Change-Id: Icff306da85e8c41cd9cd6406ed10d586fea0ddde
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/195985
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