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();
+if (%GetOptimizationStatus(foo) != 4) {

[Jakob Kummerow, 2014/11/19 20:46:16]

Just use assertOptimized(foo) / assertUnoptimized(foo), it'll do all the
required magic.

[ulan, 2014/11/20 15:23:30]

Done.

+  assertEquals(1, %GetOptimizationStatus(foo));
+  foo(10);
+  assertEquals(2, %GetOptimizationStatus(foo));
+}