[PATCH] PR libstdc++/92124 on hashtable

[François Dumont]

 From what I understood from recent fix the unordered containers need to 
be updated the same way.

I hope you'll appreciate the usage of rvalue forwarding. Containers node 
values are moved as soon as _M_assign is called with a rvalue reference 
to the source container.

Additionnaly this patch removes usages of lambdas in _Hashtable.

If you confirm it I'll check for the same on _Rb_tree.

 Â Â Â  * include/bits/hashtable.h (_Hashtable<>::__alloc_node_gen_t): New
 Â Â Â  template alias.
 Â Â Â  (_Hashtable<>::__mv_if_value_type_mv_noexcept): New.
 Â Â Â  (_Hashtable<>::__fwd_value): New.
 Â Â Â  (_Hashtable<>::_M_assign_elements<>): Remove _NodeGenerator template
 Â Â Â  parameter.
 Â Â Â  (_Hashtable<>::_M_assign<>): Add _Ht template parameter.
 Â Â Â  (_Hashtable<>::operator=(const _Hashtable<>&)): Adapt.
 Â Â Â  (_Hashtable<>::_M_move_assign): Adapt.
 Â Â Â  (_Hashtable<>::_Hashtable(const _Hashtable&)): Adapt.
 Â Â Â  (_Hashtable<>::_Hashtable(const _Hashtable&, const allocator_type&)):
 Â Â Â  Adapt.
 Â Â Â  (_Hashtable<>::_Hashtable(_Hashtable&&, const allocator_type&)):
 Â Â Â  Adapt.
 Â Â Â  * testsuite/23_containers/unordered_set/92124.cc: New.

Tested under Linux x86_64.

Ok to commit ?

François

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