C2: Consider enabling auto-vectorization for simple reductions (disabled by JDK-8078563)

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      Reconsider the decision to disable autovectorization for simple reductions made by JDK-8078563.

      Richard Startin reports [1] that artificially complicating reduction operation (to make it eligible for auto-vectorization) produces a better result than original code (sum of elements).

      [1] http://richardstartin.uk/tricking-java-into-adding-up-arrays-faster/

            Assignee:
            Unassigned
            Reporter:
            Vladimir Ivanov
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              Created:
              Updated: