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

[Karthik Bhat]

Hi Nadav, 
Thanks for your time and inputs.
Added documentation for the patch as per suggession.

Yes we had run llvm lit test cases with/without patch. 
The results were submitted previously on phabricator you can have a look at the results on
http://reviews.llvm.org/file/data/s6jdoxcsfh2d5pog2a6x/PHID-FILE-lfpzyswqkebd2fj36nu6/performance.png
There were no considerable regressions and we saw one test case performance was improved.

Thanks once again for spending time on this patch.
Regards
Karthik Bhat

http://reviews.llvm.org/D3800

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