[PATCH] Teach DAGCombier how to fold according to rule (shl (zext (shr A, X)), X) => (zext (shl (shr A, X), X))

Owen Anderson resistor at mac.com
Wed Sep 25 10:45:31 PDT 2013

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  LGTM.

http://llvm-reviews.chandlerc.com/D1660

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