Upgrade V8 to version 4.9.385.28

https://chromium.googlesource.com/v8/v8/+/4.9.385.28

FPIIM-449

Change-Id: I4b2e74289d4bf3667f2f3dc8aa2e541f63e26eb4
diff --git a/test/mjsunit/regress/regress-crbug-578039-Proxy_construct_prototype_change.js b/test/mjsunit/regress/regress-crbug-578039-Proxy_construct_prototype_change.js
new file mode 100644
index 0000000..30b3f21
--- /dev/null
+++ b/test/mjsunit/regress/regress-crbug-578039-Proxy_construct_prototype_change.js
@@ -0,0 +1,14 @@
+// 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 target() {};
+
+var proxy = new Proxy(target, {
+  get() {
+    // Reset the initial map of the target.
+    target.prototype = 123;
+  }});
+
+new proxy();