[generators] Always call function with closure context when resuming.

test/mjsunit/regress/regress-681171-3.js

Index: test/mjsunit/regress/regress-681171-3.js
diff --git a/test/mjsunit/regress/regress-681171-3.js b/test/mjsunit/regress/regress-681171-3.js
new file mode 100644
index 0000000000000000000000000000000000000000..a299e8e522db82adc4b514b5ff2d909077abb531
--- /dev/null
+++ b/test/mjsunit/regress/regress-681171-3.js
@@ -0,0 +1,11 @@
+// Copyright 2017 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: --always-opt --function-context-specialization --verify-heap
+
+(function __f_5() {
+    var __v_0 = { *['a']() { yield 2; } };
+    var __v_3 = __v_0.a();
+    __v_3.next();
+})();