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Author SHA1 Message Date
Dale Johannesen a94e36bbee Reapply 122353-122355 with fixes. 122354 was wrong; 
the shift type was needed one place, the shift count
type another.  The transform in 123555 had the same
problem.

llvm-svn: 122366
 2010-12-21 21:55:50 +00:00
Dale Johannesen 87c47499c6 Revert 122353-122355 for the moment, they broke stuff. 
llvm-svn: 122360
 2010-12-21 21:22:27 +00:00
Dale Johannesen caf42aa6a4 Add a new transform to DAGCombiner. 
llvm-svn: 122355
 2010-12-21 20:10:51 +00:00