[SpaceEngine] Remove isUseful and don't include redundant spaces.
#17805
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There is no reason to include spaces which have already been covered by some other cases in the `switch` statement, excluding such cases helps to reduce some of the work done by exhaustiveness checker.
Since empty sub-spaces are eagerly pruned and disjuncts/constructors are converted to empty early, `isUseful` could be replaced with `!isEmpty()`.
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@swift-ci please test |
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Since empty sub-spaces are eagerly pruned and disjuncts/constructors
are converted to empty early,
isUsefulcould be replaced with!isEmpty().There is no reason to include spaces which have already been covered
by some other cases in the
switchstatement, excluding such caseshelps to reduce some of the work done by exhaustiveness checker.