Fix treatment of rest pattern in array destructuring.

test/mjsunit/es6/regress/regress-4759.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.
+
+function iterable(done) {
+  return {
+    [Symbol.iterator]: function() {
+      return {
+        next: function() {
+          if (done) return { done: true };
+          done = true;
+          return { value: 42, done: false };
+        }
+      }
+    }
+  }
+}
+
+var [...result] = iterable(true);
+assertEquals([], result);
+
+var [...result] = iterable(false);
+assertEquals([42], result);