Leave a stub in its place that re-exports package:dart2native/sdk.dart
and an implementation of checkArtifactExists, which used to be part of
the Sdk class, to limit the amount of changes needed.
This move is made so that followup CLs can use the Sdk class from
dart2native without causing a cyclic dependency.
TEST=ci
Cq-Include-Trybots: luci.dart.try:pkg-linux-release-arm64-try,pkg-linux-release-try,pkg-mac-release-arm64-try,pkg-mac-release-try,pkg-win-release-arm64-try,pkg-win-release-try,dart-sdk-linux-riscv64-try,dart-sdk-linux-arm64-try,dart-sdk-linux-try,dart-sdk-mac-try,dart-sdk-win-arm64-try,dart-sdk-win-try,dart-sdk-mac-arm64-try
Change-Id: I492084031efce1e6747f93f2067249425fe9b922
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/442220
Commit-Queue: Tess Strickland <sstrickl@google.com>
Reviewed-by: Ben Konyi <bkonyi@google.com>
Tess Strickland
63082bebbb