[PATCH] Add #pragma vectorize enable/disable to LLVM

[Renato Golin]

  Adding changes proposed by reviews:
   * Forcing vectorization disables size concerns
   * removing obviously wrong TBAA metadata links
   * Adding comments (FIXME) on Pass Manager to account for LateVectorization and clean-up passes better

Hi nadav,

http://llvm-reviews.chandlerc.com/D2328

CHANGE SINCE LAST DIFF
  http://llvm-reviews.chandlerc.com/D2328?vs=5906&id=5917#toc

Files:
  include/llvm/Transforms/Vectorize.h
  lib/Transforms/IPO/PassManagerBuilder.cpp
  lib/Transforms/Vectorize/LoopVectorize.cpp
  test/Transforms/LoopVectorize/metadata-enable.ll
  tools/opt/opt.cpp
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