[co19] Roll co19 to 58e95961ea492a749ca6eccf5586fdf8271f8266
[co19] Roll co19 to 58e95961ea492a749ca6eccf5586fdf8271f8266

2020-09-28 sgrekhov@unipro.ru Some 'main()' static analysis tests fixed to not to fail on dart2js
2020-09-28 sgrekhov@unipro.ru Fixes 941. Change flow analysis tests around ==/!== according to the changed spec
2020-09-25 irina.arkhipets@gmail.com More changes for 942: LanguageFeatures/Simple-bounds tests updated.
2020-09-25 sgrekhov@unipro.ru 924. Added tests for the new static analysis of 'main'
2020-09-25 irina.arkhipets@gmail.com One more fix for 942: more Simple-bounds tests corrected.
2020-09-25 irina.arkhipets@gmail.com Fixes 942: LanguageFeature/Simple-bounds tests updated. Common Utils function F<X> toF<X>(X x) improved.
2020-09-23 sgrekhov@unipro.ru Fixes 939. Flow analysis tests changed to not expect promotion

Change-Id: I881d6fb8602f22d0d836a5d42da5dc9f136cadf6
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/164788
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