Richard Sandiford 95bc5f92ee [SystemZ] Move sign_extend optimization to PerformDAGCombine ...

The target was marking SIGN_EXTEND as Custom because it wanted to optimize
certain sign-extended shifts.  In all other respects the extension is Legal,
so it'd be better to do the optimization in PerformDAGCombine instead.

No functional change intended.

llvm-svn: 203234

2014-03-07 11:34:35 +00:00

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