[PATCH] Fix information loss in branch probability computation.

[Diego Novillo]

This version fixes the 32bit overflow check in visitSwitch()


http://reviews.llvm.org/D9442

Files:
  lib/Analysis/BranchProbabilityInfo.cpp
  lib/CodeGen/SelectionDAG/SelectionDAGBuilder.cpp
  test/Analysis/BranchProbabilityInfo/pr22718.ll
  test/CodeGen/X86/MachineBranchProb.ll

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