e774f48c0a
This change migrates pkg/vm/testcases to null safety and removes passing of non-nullable experimental flag in tests. TEST=ci Issue: https://github.com/dart-lang/sdk/issues/46620 Change-Id: Ief936dfd13aeb60457100fe6dead0f0fd06fd135 Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/208361 Reviewed-by: Johnni Winther <johnniwinther@google.com> Commit-Queue: Alexander Markov <alexmarkov@google.com>