[PATCH][Hashtable 4/6] Clean local_iterator implementation

[François Dumont]

Simplify local_iterator implementation. It makes local_iterator and 
iterator comparable which is used in debug containers.

 Â Â Â  * include/bits/hashtable_policy.h (_Node_iterator_base()): New.
 Â Â Â  (operator==(const _Node_iterator_base&, const _Node_iterator_base&)):
 Â Â Â  Make hidden friend.
 Â Â Â  (operator!=(const _Node_iterator_base&, const _Node_iterator_base&)):
 Â Â Â  Make hidden friend.
 Â Â Â  (_Local_iterator_base<>): Inherits _Node_iterator_base.
 Â Â Â  (_Local_iterator_base<>::_M_cur): Remove.
 Â Â Â  (_Local_iterator_base<>::_M_curr()): Remove.
 Â Â Â  (operator==(const _Local_iterator_base&, const _Local_iterator_base&)):
 Â Â Â  Remove.
 Â Â Â  (operator!=(const _Local_iterator_base&, const _Local_iterator_base&)):
 Â Â Â  Remove.
 Â Â Â  * include/debug/unordered_map (unordered_map<>::_M_invalidate): Adapt.
 Â Â Â  (unordered_multimap<>::_M_invalidate): Adapt.
 Â Â Â  * include/debug/unordered_set (unordered_set<>::_M_invalidate): Adapt.
 Â Â Â  (unordered_multiset<>::_M_invalidate): Adapt.

Tested under Linux x86_64.

François

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