Sanjay Patel ecaf343fe7 [DAG] move fold (select C, 0, 1 -> xor C, 1) to a helper function; NFC
We're missing at least 3 other similar folds based on what we have in InstCombine. 

llvm-svn: 283596
2016-10-07 20:47:51 +00:00
2016-10-07 19:54:57 +00:00
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