Oops. Make "--legacy" actually do something.
Oops. Make "--legacy" actually do something.

Change-Id: Id372184d2544f68f4b6778d582c0f90be5313520
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/142800
Auto-Submit: Bob Nystrom <afede3a9ebedb865bee78398feff6fbe97068f17@google.com>
Commit-Queue: Nicholas Shahan <03847abd2d8aadfe859ecb98095a31f9f515dc47@google.com>
Reviewed-by: Nicholas Shahan <03847abd2d8aadfe859ecb98095a31f9f515dc47@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