Remove TransformArrayRef, FilterIterator, and FilterRange #27493
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We have a lot of "transform a range" types already: llvm::mapped_iterator, swift::TransformRange and swift::TransformIterator, and swift::ArrayRefView for static transformations. By improving TransformRange a bit, we can get rid of one more layer, TransformArrayRef, without losing any real functionality.
FilterIterator and FilterRange were just unused.