drop any WrapArguemntNode in quote

com.oracle.truffle.r.nodes.builtin/src/com/oracle/truffle/r/nodes/builtin/base/Quote.java

@@ -58,7 +58,7 @@ public abstract class Quote extends RBuiltinNode {
             ConstantNode cnode = (ConstantNode) unode;
             return cnode.getValue();
         } else {
-            return RDataFactory.createLanguage(expr.getRep());
+            return RDataFactory.createLanguage(unode);
         }
     }
 }