early_binding pass

Talked to dmitry about it.

The goal here is to do the early_binding at compile time, for each op_array, when the class_table of each op_array is known.
This pass code binds the inherited class to its parent.

However, this seems to be really really close to what ZEND_DECLARE_INHERITED_CLASS_DELAYED does. It binds the inheritence tree, but at script loading. I didnt know about that when preparing my patch.

It however seems to bug as I get "class Serializable not found" when I run it against an app of mine :-p