[llvm] [SelectionDAG] Preserve poison for abs INT_MIN lowering (PR #183851)

[Simon Pilgrim via llvm-commits]

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@@ -4314,8 +4316,9 @@ SDValue DAGCombiner::visitSUB(SDNode *N) {
     }
 
     // Convert 0 - abs(x).
-    if (N1.getOpcode() == ISD::ABS && N1.hasOneUse() &&
-        !TLI.isOperationLegalOrCustom(ISD::ABS, VT))
+    if ((N1.getOpcode() == ISD::ABS || N1.getOpcode() == ISD::ABS_MIN_POISON) &&
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RKSimon wrote:

SDPatternMatch::m_AnyABS() maybe?

https://github.com/llvm/llvm-project/pull/183851