[PATCH] [BUG] "Rotate Loop" pass kills "llvm.vectorizer.enable" metadata

[Zinovy Nis]

  My new patch fixes the issue kindly pointed by Alexander M.

  Please re-review it again.

Hi atrick, hfinkel, amusman, ABataev, nadav, chandlerc,

http://reviews.llvm.org/D3348

CHANGE SINCE LAST DIFF
  http://reviews.llvm.org/D3348?vs=8464&id=8508#toc

Files:
  lib/Transforms/Scalar/LoopRotation.cpp
  lib/Transforms/Vectorize/LoopVectorize.cpp
  test/Transforms/LoopVectorize/vect.omp.persistence.ll
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