[co19] Enable instantiate to bound tests
[co19] Enable instantiate to bound tests

Change-Id: Ie7894c39ec5fdee519c617862c32e3aaa263488b
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/161161
Reviewed-by: Alexander Thomas <29642742b6693024c89de8232f2e2542cf7eedf7@google.com>
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