Sanjay Patel 215dcbf4db [SelectionDAG] try to convert funnel shift directly to rotate if legal ...

If the DAGCombiner's rotate matching was working as expected, 
I don't think we'd see any test diffs here. 

This sidesteps the issue of custom lowering for rotates raised in PR38243:
https://bugs.llvm.org/show_bug.cgi?id=38243
...by only dealing with legal operations.

llvm-svn: 337966

2018-07-25 21:38:30 +00:00

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