[dart2js] Handle `null` as a switch statement case value.

Bug: 51527
Change-Id: I6203c9aa668689bb44800082864174b9fb215289
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/310500
Reviewed-by: Nicholas Shahan <nshahan@google.com>
Commit-Queue: Stephen Adams <sra@google.com>

https://dart.googlesource.com/sdk/+/5a595124b47efadbebf95146a20d4645864fd93b
1 file changed
tree: 24513c79efc9d74b7acde3ca4a33bfa643c61842
  1. commits.json