[PATCH] Allow 0-weight branches in BranchProbabilityInfo.

[Diego Novillo]

- Only floor branch weights to 1 in visitSwitch().


http://reviews.llvm.org/D9533

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

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