[PATCH] Fix PR19657 : SLP vectorization doesn't combine scalar load to vector loads

[Karthik Bhat]

Hi Nadav, Arnold,
Clang format code as per review comments. I think we cannot swap the right and left in buildTree_rec as we need to process the larger subtree before the smaller one and in case were Left subtree is larger we need to process it first hence we will need the check.

Does this look good to commit? I'm also looking into a generic solution for this problem as Raul suggested but it might need more time and benchmarking to make sure the benifit outweighs the overhead.

Thanks for your time.
Regards
Karthik Bhat

http://reviews.llvm.org/D3800

Files:
  lib/Transforms/Vectorize/SLPVectorizer.cpp
  test/Transforms/SLPVectorizer/X86/pr19657.ll
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