Remove CallFunctionStub, always call through the Call builtin (also from CallIC)

test/mjsunit/call-cross-realm.js

Index: test/mjsunit/call-cross-realm.js
diff --git a/test/mjsunit/call-cross-realm.js b/test/mjsunit/call-cross-realm.js
new file mode 100644
index 0000000000000000000000000000000000000000..68e5b1682b58e17cebe7a869d27a27e6edf0f2f4
--- /dev/null
+++ b/test/mjsunit/call-cross-realm.js
@@ -0,0 +1,13 @@
+// Copyright 2015 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.
+
+Realm.create();
+var object = Realm.eval(1, "Object");
+var f = Realm.eval(1, "function f() { return this }; f");
+
+Number.prototype.f = f;
+var number = 1;
+assertEquals(object.prototype, f.call(number).__proto__.__proto__);
+assertEquals(object.prototype, number.f().__proto__.__proto__);
+assertEquals(Realm.global(1), f());