[PATCH] [LoopInterchange] Add support to interchange loops with reductions.

[Karthik Bhat]

Hi Renato,
Updated test cases as per comments. Please let me know if this looks good to you.
Verified with Debug+Assert build and make check-all on X86_64.

Thanks and Regards
Karthik Bhat


http://reviews.llvm.org/D8314

Files:
  lib/Transforms/IPO/PassManagerBuilder.cpp
  lib/Transforms/Scalar/LoopInterchange.cpp
  test/Transforms/LoopInterchange/reductions.ll

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