[llvm] [SelectionDAG] Propagate poison in getNode with two operands if the second is poison. (PR #135387)

[Matt Arsenault via llvm-commits]

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@@ -7586,6 +7586,14 @@ SDValue SelectionDAG::getNode(unsigned Opcode, const SDLoc &DL, EVT VT,
     }
   }
 
+  /*
+  if (N2.getOpcode() == ISD::POISON) {
+    switch (Opcode) {
+    case ISD::ADD:
+      return getPOISON(VT);
+    }
+  }*/
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arsenm wrote:

Commented out code 

https://github.com/llvm/llvm-project/pull/135387