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Commit bf14f206 authored by Chris Lattner's avatar Chris Lattner
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When replacing a node in SimplifyDemandedBits, if the old node used any 

single-use nodes, they will be dead soon.  Make sure to remove them before
processing other nodes.  This implements CodeGen/X86/shl_elim.ll

llvm-svn: 36244
parent 1af7b845
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