[PATCH] Move llvm.loop metadata in SplitCriticalEdge

[Johannes Doerfert]

Added test cases and implemented all possible cases an edge with annotations could be splitted.

http://reviews.llvm.org/D5344

Files:
  lib/Transforms/Utils/BreakCriticalEdges.cpp
  test/Transforms/Util/break-critical-edges-loop-metadata.ll
  test/Transforms/Util/break-critical-edges-loops-metadata.ll
  test/Transforms/Util/break-critical-edges-loops-same-latch-metadata.ll
  test/Transforms/Util/break-critical-edges-no-loop-info-but-loop-id-metadata.ll
  test/Transforms/Util/break-critical-edges-non-loop-backedge-but-llvm-loop-metadata.ll
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