Test GLB and LUB symmetry for FunctionType(s).
Test GLB and LUB symmetry for FunctionType(s).

https://github.com/dart-lang/sdk/issues/26126 was fixed,
so we can do this properly now.

R=1f7641b6b14c52b9163524ab8d9aabff80176f21@google.com, paulberry@google.com

Change-Id: I938df344a96470f461f8d7f4cf530bc0b290453c
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/124460
Reviewed-by: Brian Wilkerson <1f7641b6b14c52b9163524ab8d9aabff80176f21@google.com>
Commit-Queue: Konstantin Shcheglov <09e4d7516628963212bf4aace2f97603d2b706e4@google.com>

dartino/dart-sdk,dart-lang/sdk,dartino/dart-sdk,dart-archive/dart-sdk,dart-archive/dart-sdk,dart-lang/sdk,dart-lang/sdk,dart-archive/dart-sdk,dart-lang/sdk,dart-archive/dart-sdk,dart-archive/dart-sdk,dartino/dart-sdk,dartino/dart-sdk,dart-lang/sdk,dart-archive/dart-sdk,dartino/dart-sdk,dart-lang/sdk,dart-archive/dart-sdk,dart-archive/dart-sdk,dartino/dart-sdk,dart-lang/sdk,dartino/dart-sdk,dartino/dart-sdk,dartino/dart-sdk,dart-lang/sdk,dart-archive/dart-sdk