Remove ARGUMENTS_VARIABLE and fix crankshaft to properly detect the arguments object and keep it al…

test/mjsunit/regress/regress-arguments-liveness-analysis.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.
 
 // Flags: --allow-natives-syntax
 
-function f() {
-  return typeof null === "object";
+function r(v) { return v.f }
+function h() { }
+function y(v) {
+  var x = arguments;
+  h.apply(r(v), x);
 };
 
-%OptimizeFunctionOnNextCall(f);
-assertTrue(f());
+y({f:3});
+y({f:3});
+y({f:3});
+
+%OptimizeFunctionOnNextCall(y);
+
+y({ f : 3, u : 4 });