[PATCH] Factor out a splitSwitchCase() function so that it can be reused.

[Daniel Jasper]

Hi chandlerc,

This is in preparation for a fix to llvm.org/PR22262.
No functional changes.

http://reviews.llvm.org/D7064

Files:
  lib/CodeGen/SelectionDAG/SelectionDAGBuilder.cpp
  lib/CodeGen/SelectionDAG/SelectionDAGBuilder.h

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