[PATCH] Switch lowering: use profile info to build weight-balanced binary search trees

[Hans Wennborg]

Addressing djasper's comments.


http://reviews.llvm.org/D9318

Files:
  lib/CodeGen/SelectionDAG/SelectionDAGBuilder.cpp
  test/CodeGen/Generic/MachineBranchProb.ll
  test/CodeGen/X86/switch.ll

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