Fix behavior of throw on yield*.

test/mjsunit/harmony/generators.js

 // Copyright 2016 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 // Flags: --ignition-generators --harmony-do-expressions
 // Flags: --allow-natives-syntax
 
 
 function MaybeOptimizeOrDeoptimize(f) {
   let x = Math.random();  // --random-seed makes this deterministic
@@ skipping 630 matching lines @@
 
 {
   let foo = function*() {
     yield* (function*() { yield 42; }());
     assertUnreachable();
   }
   g = foo();
   assertEquals({value: 42, done: false}, Next(g));
   assertEquals({value: 23, done: true}, Return(g, 23));
 }
+
+{
+  let iterable = {
+    [Symbol.iterator]() {
+      return { next() { return {} } };
+    }
+  };
+  let foo = function*() { yield* iterable };
+  g = foo();
+  g.next();
+  assertThrows(() => Throw(g), TypeError);
+}