d36805e0ac
This also fixes the implementation of 'null is T' in legacy vs opted-in library by making it independent of strong/weak mode. Includes updates to type propagation and call specializer. Change-Id: I2d347ef277e08cef779faf51a972e863244ef095 Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/130922 Commit-Queue: Régis Crelier <regis@google.com> Reviewed-by: Alexander Markov <alexmarkov@google.com> Reviewed-by: Liam Appelbe <liama@google.com>