Fix bug 33239.

js/rhino/org/mozilla/javascript/IRFactory.java

@@ -953,6 +953,7 @@ public class IRFactory {
             case TokenStream.DEC:
             case TokenStream.SETPROP:
             case TokenStream.SETELEM:
+            case TokenStream.SETNAME:
             case TokenStream.CALL:
             case TokenStream.NEW:
                 return true;

js/rhino/src/org/mozilla/javascript/IRFactory.java

@@ -953,6 +953,7 @@ public class IRFactory {
             case TokenStream.DEC:
             case TokenStream.SETPROP:
             case TokenStream.SETELEM:
+            case TokenStream.SETNAME:
             case TokenStream.CALL:
             case TokenStream.NEW:
                 return true;