[PATCH] Allow 0-weight branches in BranchProbabilityInfo.

[Diego Novillo]

REPOSITORY
  rL LLVM

http://reviews.llvm.org/D9533

Files:
  llvm/trunk/lib/Analysis/BranchProbabilityInfo.cpp
  llvm/trunk/lib/CodeGen/SelectionDAG/SelectionDAGBuilder.cpp
  llvm/trunk/test/Transforms/SampleProfile/branch.ll
  llvm/trunk/test/Transforms/SampleProfile/calls.ll
  llvm/trunk/test/Transforms/SampleProfile/propagate.ll

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