* Use dartk as the default compiler for runtime=vm.
* Status file entries for checking for the `none` compiler now either
use dartk or are deleted.
Tested: Standard CQ and local testing.
Fixes: https://github.com/dart-lang/sdk/issues/50241
Change-Id: I7a08d3e491ae1c82a0348fb66ea7b557398f97e5
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/264682
Reviewed-by: Siva Annamalai <asiva@google.com>
Reviewed-by: Lasse Nielsen <lrn@google.com>
Commit-Queue: Alexander Thomas <athom@google.com>
