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Author SHA1 Message Date
Dan Gohman 954f49014d Fold (add x, shl(0 - y, n)) -> sub(x, shl(y, n)), to simplify some code 
that SCEVExpander can produce when running on behalf of LSR.

llvm-svn: 93949
 2010-01-19 23:30:49 +00:00