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Summary:Gains minor perf improvement in the for loop by caching the array length Closes https://github.com/facebook/react-native/pull/6671 Differential Revision: D3102064 fb-gh-sync-id: 2303d83f3672a2768c60d0e5dae999b1dda0d6bd fbshipit-source-id: 2303d83f3672a2768c60d0e5dae999b1dda0d6bd