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

[Weiming Zhao]

copyMetaData -> copyMetadata
and add comments for the fallthrough case


http://reviews.llvm.org/D10458

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

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