Bug 18347: Sparse switches lowered to an else-if chain

[Jasper Neumann]

Hi all,

here is the patch as described in
http://llvm.org/bugs/show_bug.cgi?id=18347

Would someone please review the patch and if OK check it in for me, please?
For testing purposes it might make sense to temporarily disable 
dispatching with jump tables by commenting out the two lines containing 
"handleJTSwitchCase" near the bottom of SelectionDAGBuilder::visitSwitch 
in llvm/lib/CodeGen/SelectionDAG/SelectionDAGBuilder.cpp and also to 
activate the logging of the splitting behavior in 
SelectionDAGBuilder::handleBTSplitSwitchCase.

Cheers
Jasper
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