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Commit 75f6037c authored by Owen Anderson's avatar Owen Anderson
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Fixes and cleanups pointed out by Chris. In general, be careful to handle 0... 

Fixes and cleanups pointed out by Chris.  In general, be careful to handle 0 results from ComputeValueKnownInPredecessors
(indicating undef), and re-use existing constant folding APIs.

llvm-svn: 112539
parent 87bb14c5
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