[llvm] [SelectionDAG] Make `(a & x) | (~a & y) -> (a & (x ^ y)) ^ y` available for all targets (PR #137641)

[Matt Arsenault via llvm-commits]

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@@ -8286,6 +8334,10 @@ SDValue DAGCombiner::visitOR(SDNode *N) {
     if (SDValue R = foldLogicTreeOfShifts(N, N0, N1, DAG))
       return R;
 
+  if (!TLI.hasAndNot(SDValue(N, 0)) && VT.isScalarInteger() && VT != MVT::i1)
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arsenm wrote:

Check the simpler conditions first. could sink the hasAndNot after the pattern checks inside foldMaskedMerge

https://github.com/llvm/llvm-project/pull/137641