[llvm] [SelectionDAG] Fix AArch64 machine verifier bug when expanding LOOP_DEPENDENCE_MASK (PR #168221)

[via llvm-commits]

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@@ -26013,9 +26013,12 @@ static SDValue reassociateCSELOperandsForCSE(SDNode *N, SelectionDAG &DAG) {
     // Try again with the operands of the SUBS instruction and the condition
     // swapped. Due to canonicalization, this only helps for non-constant
     // operands of the SUBS instruction.
-    std::swap(CmpOpToMatch, CmpOpOther);
-    if (SDValue R = Fold(getSwappedCondition(CC), CmpOpToMatch, CmpOpToMatch))
-      return R;
+    auto NewCC = getSwappedCondition(CC);
+    if (NewCC != AArch64CC::AL) {
+      std::swap(CmpOpToMatch, CmpOpOther);
+      if (SDValue R = Fold(NewCC, CmpOpToMatch, CmpOpToMatch))
+        return R;
+    }
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AZero13 wrote:

Yeah that commit was fused in by mistake. 

https://github.com/llvm/llvm-project/pull/168221