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Commit 1847f6dd authored by Chris Lattner's avatar Chris Lattner
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handle undef values much more carefully: generalize the resolveundefbranches 

code to handle instructions as well, so that we properly fold things like
X & undef -> 0.
This fixes Transforms/SCCP/2006-12-19-UndefBug.ll

llvm-svn: 32715
parent aef35566
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