[co19] Language/Functions tests enabled
[co19] Language/Functions tests enabled

Change-Id: I8f7487ccc8a3f387bc0821e58f2df70efde11eb5
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/151521
Reviewed-by: Alexander Thomas <29642742b6693024c89de8232f2e2542cf7eedf7@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