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              Though the ideal max_splits for n < 1
              million (or so) on x86 seems to be substantially
              larger, enabling a roughly 15% speedup for such tests, this optimization
              isn't general, and doesn't apply for n > 1 million.
              A too large max_splits can cause sort to take
              more than twice as long, so it should be set on the low end of the
              reasonable range, where it is right now.