[PATCH] add a convenience method to copy wrapping, exact, and fast-math flags (NFC)

[Sanjay Patel]

Thanks, David! Patch updated.

http://reviews.llvm.org/D5138

Files:
  include/llvm/IR/InstrTypes.h
  lib/IR/Instructions.cpp
  lib/Transforms/Vectorize/LoopVectorize.cpp
  test/Transforms/LoopVectorize/exact.ll
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