[PATCH] Correctly handle range metadata when hoisting instructions out of then/else into if blocks

[Björn Steinbrink]

Updated the patch to introduce a helper to combine instruction metadata and
handle all metadata for the hoisted instructions.

http://reviews.llvm.org/D4595

Files:
  include/llvm/Transforms/Utils/Local.h
  lib/Transforms/Scalar/GVN.cpp
  lib/Transforms/Utils/Local.cpp
  lib/Transforms/Utils/SimplifyCFG.cpp
  lib/Transforms/Vectorize/BBVectorize.cpp
  test/Transforms/SimplifyCFG/hoist-with-range.ll
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