[PATCH] Allow vectorization of bit intrinsics in BB Vectorizor

[Karthik Bhat]

Hi hfinkel, echristo,

Hi Hal,Eric,
Follow up patch on r207085. This allows vectorization of bit intrinsics function calls such as bswap,ctpop,ctlz and cttz.
Could you please review the same and let me know if this is good to commit?
Thanks
Karthik Bhat

http://reviews.llvm.org/D3478

Files:
  include/llvm/Transforms/Vectorize.h
  lib/Transforms/Vectorize/BBVectorize.cpp
  test/Transforms/BBVectorize/simple-int.ll
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