[PATCH] [OPENMP][LV] Respect Hints.Force meta-data for loops in LoopVectorizer

[Zinovy Nis]

  Also force vectorization if a trip count is lower than the threshold.

Hi ABataev, amusman, nadav, hfinkel,

http://reviews.llvm.org/D3423

CHANGE SINCE LAST DIFF
  http://reviews.llvm.org/D3423?vs=8718&id=8724#toc

Files:
  lib/Transforms/Vectorize/LoopVectorize.cpp
  test/Transforms/LoopVectorize/X86/vect.omp.force.ll
  test/Transforms/LoopVectorize/X86/vect.omp.force.small-tc.ll
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