[generators] Desugar yield*.

src/parsing/parser-base.h

Index: src/parsing/parser-base.h
diff --git a/src/parsing/parser-base.h b/src/parsing/parser-base.h
index b54273f1ad84ec6f7cfebc4dc08e16b9b5ff503a..16ea64d9a5b6f5110d7eb48a1d1282c688150338 100644
--- a/src/parsing/parser-base.h
+++ b/src/parsing/parser-base.h
@@ -2146,10 +2146,7 @@ ParserBase<Traits>::ParseYieldExpression(ExpressionClassifier* classifier,
     }
   }
   if (kind == Yield::kDelegating) {
-    // var iterator = subject[Symbol.iterator]();
-    // Hackily disambiguate o from o.next and o [Symbol.iterator]().
-    // TODO(verwaest): Come up with a better solution.
-    expression = this->GetIterator(expression, factory(), pos + 1);
+    return Traits::RewriteYieldStar(generator_object, expression, pos);
   }
   // Hackily disambiguate o from o.next and o [Symbol.iterator]().
   // TODO(verwaest): Come up with a better solution.