Corrections in lub tests, cf. #43717, #43720.
The tests least_upper_bound_{futureor,function}_test.dart are corrected:
The expected least upper bound was changed in one case in each test,
because the case matches a rule earlier in the ruleset, so the new rules
are not used in these cases.
Change-Id: I1f5f303ccde10af6084771a90d92d81d636909d6
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/166635
Reviewed-by: Lasse R.H. Nielsen <lrn@google.com>
Commit-Queue: Erik Ernst <eernst@google.com>
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