[PATCH] Allow 0-weight branches in BranchProbabilityInfo.

[Hans Wennborg]

================
Comment at: lib/CodeGen/SelectionDAG/SelectionDAGBuilder.cpp:8024
@@ -8013,1 +8023,3 @@
+      Weight = std::max(
+          1u, BPI->getEdgeWeight(SI.getParent(), I.getSuccessorIndex()));
       assert(Weight <= UINT32_MAX / SI.getNumSuccessors());
----------------
This looks good. I can address this TODO later.

I figured this would be the only change necessary for the switch lowering code. Are the changes to getEdgeWeight() and lowerWorkItem() also necessary?

http://reviews.llvm.org/D9533

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