[PATCH] Add support to vectorize ctlz, cttz and powi intrinsics in LoopVectorizer

[Karthik Bhat]

Hi nadav, aschwaighofer,

Hi Nadav,Arnold,
This is a follow up patch after http://reviews.llvm.org/D3851 .
Patch adds support to vectorize intrinsics powi,cttz,ctlz in Loopvectorizer.
Please if you could review these 2 patches.

Thanks
Karthik Bhat

http://reviews.llvm.org/D3937

Files:
  lib/Transforms/Vectorize/LoopVectorize.cpp
  test/Transforms/LoopVectorize/intrinsic.ll
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