[DAGCombiner] Remove (xor (xor x, c1), c2) -> (xor x, (xor c1, c2)) fold. NFCI.
More general cases are already handled by constant canonicalization and then the ReassociateOps call at line 5327 llvm-svn: 321280
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More general cases are already handled by constant canonicalization and then the ReassociateOps call at line 5327 llvm-svn: 321280