[PATCH] Fix bug 23851: Preserve metadata for the unswitched branch in loop-unswitch

[Weiming Zhao]

1. White list the metadata to be copied. Currently, prof and dbg nodes are copied.
2. Handle the case if True/False is swapped in the new branch
3. I prefer passing "Instruction*" instead of "SmallVectorImpl< std::pair< unsigned, MDNode * >> &MDs"  because 1) the latter is much longer 2) each call site needs to prepare the vector and call getAllMetadata().


http://reviews.llvm.org/D10458

Files:
  lib/Transforms/Scalar/LoopUnswitch.cpp
  test/Transforms/LoopUnswitch/2015-06-17-Metadata.ll

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