[PATCH] Separate Machine IR from CodeGen: Move SplitCriticalEdge out of MachineBasicBlock

[Alex Lorenz]

I've updated the patch based on Duncan's comments:

- Renamed the cpp + header files 'MachineIRUtils' to 'SplitCriticalEdge'
- Fixed the function's name (it starts with lowercase now)
- Got rid of unnecessary namespace
- Fixed the function's comment


REPOSITORY
  rL LLVM

http://reviews.llvm.org/D10064

Files:
  include/llvm/CodeGen/MachineBasicBlock.h
  include/llvm/CodeGen/SplitCriticalEdge.h
  lib/CodeGen/CMakeLists.txt
  lib/CodeGen/MachineBasicBlock.cpp
  lib/CodeGen/MachineLICM.cpp
  lib/CodeGen/MachineSink.cpp
  lib/CodeGen/PHIElimination.cpp
  lib/CodeGen/SplitCriticalEdge.cpp

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