[dart2js] Fix spurious `!` in ConstantMap.

Change-Id: I45ab75005c4f3d658c476886ede3ba37dbb067e9
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/204625
Commit-Queue: Mayank Patke <fishythefish@google.com>
Reviewed-by: Stephen Adams <sra@google.com>

https://dart.googlesource.com/sdk/+/c015e02180d0e4231eacc71817f6230182203bc2
1 file changed
tree: 35a1b40e9769de6dafea35374928b59e1ce10807
  1. commits.json