a128973291
This improves the subtype check by ~27%. Using subtype_measure.dart the test result was: TTestResult[significant: -27.74% +/- 2.03% (-34846.20 +/- 2548.23) (at least -32297.97)] Change-Id: I908fe8807f7b265c59f6e5f83e3e8a444eb11743 Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/387965 Reviewed-by: Jens Johansen <jensj@google.com> Commit-Queue: Johnni Winther <johnniwinther@google.com>