Remove unordered containers iterators default initialization

[François Dumont]

Hi

     Following N3644 discussion thread here is a patch proposal to 
remove default zero-initialization of unordered containers iterator. I 
also took the time to remove default zero-init of nodes _M_nxt pointer.

2013-11-25  François Dumont  <fdumont@gcc.gnu.org>

     * include/bits/hashtable_policy.h (_Hash_node_base): Default
     default constructor.
     (_Node_iterator): Likewise.
     (_Node_const_iterator): Likewise.
     * include/bits/hashtable.h: Adapt.

Tested under Linux x86_64.

Ok to commit ?

François



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