[SelectionDAGISel] Use getSignedConstant for OPC_EmitInteger.

Author: topperc

llvm/lib/CodeGen/SelectionDAG/SelectionDAGISel.cpp

@@ -3784,7 +3784,9 @@ void SelectionDAGISel::SelectCodeCommon(SDNode *NodeToMatch,
       if (Opcode >= OPC_EmitInteger && Opcode <= OPC_EmitInteger64)
         Val = decodeSignRotatedValue(Val);
       RecordedNodes.push_back(std::pair<SDValue, SDNode *>(
-          CurDAG->getTargetConstant(Val, SDLoc(NodeToMatch), VT), nullptr));
+          CurDAG->getSignedConstant(Val, SDLoc(NodeToMatch), VT,
+                                    /*isTarget=*/true),
+          nullptr));
       continue;
     }
     case OPC_EmitRegister: