Improve performance characteristics of Vector iterators to better match Vec iterators#104

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jessegrosjean wants to merge 2 commits intobodil:masterfrom jessegrosjean:master

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Commits on Sep 24, 2019

Optimized versions of len, count, and nth for Vector iterators
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More work optimizing Vector Iterators to for len, count, nth, and nth_back
jessegrosjean
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