Upgrade V8 to 5.1.281.57  DO NOT MERGE

FPIIM-449

Change-Id: Id981b686b4d587ac31697662eb98bb34be42ad90
(cherry picked from commit 3b9bc31999c9787eb726ecdbfd5796bfdec32a18)
diff --git a/test/mjsunit/compiler/regress-600593.js b/test/mjsunit/compiler/regress-600593.js
new file mode 100644
index 0000000..c93f2ab
--- /dev/null
+++ b/test/mjsunit/compiler/regress-600593.js
@@ -0,0 +1,21 @@
+// 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: --allow-natives-syntax
+
+"use strict"
+
+function f(c) {
+  if (c) { throw new Error(); }
+  throw new Error();
+};
+
+function Error()  {
+  return arguments.length;
+}
+
+assertThrows(function() { f(true); });
+assertThrows(function() { f(false); });
+%OptimizeFunctionOnNextCall(f);
+assertThrows(function() { f(true); });