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  1. Apache Arrow
  2. ARROW-7378

[C++][Gandiva] Loop vectorization broken in IR optimization

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      yibo pointed out in the mailing list that this is broken.

       
      I found that there is something in the last change to llvm_generator.cc that broke the auto vectorization.
       
      https://github.com/apache/arrow/commit/165b02d2358e5c8c2039cf626ac7326d82e3ca90
       
      If I undo this one patch, I can see the vectorization happen with Yibo Cai's test.
       

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              pravindra Pindikura Ravindra
              pravindra Pindikura Ravindra
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