[co19] Roll co19_2 to f7f583366396cb1457e58c9bfb6d6e53dc21d741

2021-03-29 [email protected] Fixes 1052. Typos in tests fixed
2021-03-29 [email protected] Fixes 1051. Fix invalid use of null in different expressions

Change-Id: Ibdf603c1ff556a328bdeb7e0af2a323bbcb6bf07
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/194720
Reviewed-by: William Hesse <[email protected]>

Author: athomas

DEPS

@@ -45,7 +45,7 @@ vars = {
   # hashes. It requires access to the dart-build-access group, which EngProd
   # has.
   "co19_rev": "812ab751c41fe8d706fd1e4aae62d2dea2887ac2",
-  "co19_2_rev": "3642f24e2e6273c6fb65a8f60cd0edc95153942e",
+  "co19_2_rev": "f7f583366396cb1457e58c9bfb6d6e53dc21d741",
 
   # The internal benchmarks to use. See go/dart-benchmarks-internal
   "benchmarks_internal_rev": "076df10d9b77af337f2d8029725787155eb1cd52",