Do not bailout from optimizing functions that use f(x, arguments)

test/mjsunit/regress/regress-3709.js

+// Copyright 2014 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
+
+function getobj() {
+  return { bar : function() { return 0}};
+}
+
+function foo() {
+  var obj = getobj();
+  var length = arguments.length;
+  if (length == 0) {
+     obj.bar();
+  } else {
+     obj.bar.apply(obj, arguments);
+  }
+}
+
+foo();
+foo();
+%OptimizeFunctionOnNextCall(foo);
+foo();
+assertOptimized(foo);
+foo(10);
+assertUnoptimized(foo);
+%ClearFunctionTypeFeedback(foo);