Add RequireInputIter on unordered containers

[François Dumont]

Unordered containers are missing the std::_RequireInputIter. Even if 
deduction guides do have them.

 Â Â Â  * include/bits/unordered_map.h
 Â Â Â  (unordered_map<>::unordered_map(_InputIterator, _InputIterator,
 Â Â Â  size_type, const hasher&)): Add _RequireInputIter constraint.
 Â Â Â  (unordered_map<>::unordered_map(_InputIterator, _InputIterator,
 Â Â Â  size_type, const allocator_type&)): Likewise.
 Â Â Â  (unordered_map<>::unordered_map(_InputIterator, _InputIterator,
 Â Â Â  size_type, const hasher&, const allocator_type&)): Likewise.
 Â Â Â  (unordered_map<>::insert(_InputIterator, _InputIterator)): Likewise.
(unordered_multimap<>::unordered_multimap(_InputIterator, _InputIterator
 Â Â Â  , size_type, const hasher&)): Add _RequireInputIter constraint.
(unordered_multimap<>::unordered_multimap(_InputIterator, _InputIterator
 Â Â Â  , size_type, const allocator_type&)): Likewise.
(unordered_multimap<>::unordered_multimap(_InputIterator, _InputIterator
 Â Â Â  , size_type, const hasher&, const allocator_type&)): Likewise.
 Â Â Â  (unordered_multimap<>::insert(_InputIterator, _InputIterator)):
 Â Â Â  Likewise.
 Â Â Â  * include/bits/unordered_set.h
 Â Â Â  (unordered_set<>::unordered_set(_InputIterator, _InputIterator,
 Â Â Â  size_type, const hasher&)): Add _RequireInputIter constraint.
 Â Â Â  (unordered_set<>::unordered_set(_InputIterator, _InputIterator,
 Â Â Â  size_type, const allocator_type&)): Likewise.
 Â Â Â  (unordered_set<>::unordered_set(_InputIterator, _InputIterator,
 Â Â Â  size_type, const hasher&, const allocator_type&)): Likewise.
 Â Â Â  (unordered_set<>::insert(_InputIterator, _InputIterator)): Likewise.
(unordered_multiset<>::unordered_multiset(_InputIterator, _InputIterator
 Â Â Â  , size_type, const hasher&)): Add _RequireInputIter constraint.
(unordered_multiset<>::unordered_multiset(_InputIterator, _InputIterator
 Â Â Â  , size_type, const allocator_type&)): Likewise.
(unordered_multiset<>::unordered_multiset(_InputIterator, _InputIterator
 Â Â Â  , size_type, const hasher&, const allocator_type&)): Likewise.
 Â Â Â  (unordered_multiset<>::insert(_InputIterator, _InputIterator)):
 Â Â Â  Likewise.
 Â Â Â  * include/debug/unordered_map
 Â Â Â  (unordered_map<>::unordered_map(_InputIterator, _InputIterator,
 Â Â Â  size_type, const hasher&)): Add _RequireInputIter constraint.
 Â Â Â  (unordered_map<>::unordered_map(_InputIterator, _InputIterator,
 Â Â Â  size_type, const allocator_type&)): Likewise.
 Â Â Â  (unordered_map<>::unordered_map(_InputIterator, _InputIterator,
 Â Â Â  size_type, const hasher&, const allocator_type&)): Likewise.
 Â Â Â  (unordered_map<>::insert(_InputIterator, _InputIterator)): Likewise.
(unordered_multimap<>::unordered_multimap(_InputIterator, _InputIterator
 Â Â Â  , size_type, const hasher&)): Add _RequireInputIter constraint.
(unordered_multimap<>::unordered_multimap(_InputIterator, _InputIterator
 Â Â Â  , size_type, const allocator_type&)): Likewise.
(unordered_multimap<>::unordered_multimap(_InputIterator, _InputIterator
 Â Â Â  , size_type, const hasher&, const allocator_type&)): Likewise.
 Â Â Â  (unordered_multimap<>::insert(_InputIterator, _InputIterator)):
 Â Â Â  Likewise.
 Â Â Â  * include/debug/unordered_set
 Â Â Â  (unordered_set<>::unordered_set(_InputIterator, _InputIterator,
 Â Â Â  size_type, const hasher&)): Add _RequireInputIter constraint.
 Â Â Â  (unordered_set<>::unordered_set(_InputIterator, _InputIterator,
 Â Â Â  size_type, const allocator_type&)): Likewise.
 Â Â Â  (unordered_set<>::unordered_set(_InputIterator, _InputIterator,
 Â Â Â  size_type, const hasher&, const allocator_type&)): Likewise.
 Â Â Â  (unordered_set<>::insert(_InputIterator, _InputIterator)): Likewise.
(unordered_multiset<>::unordered_multiset(_InputIterator, _InputIterator
 Â Â Â  , size_type, const hasher&)): Add _RequireInputIter constraint.
(unordered_multiset<>::unordered_multiset(_InputIterator, _InputIterator
 Â Â Â  , size_type, const allocator_type&)): Likewise.
(unordered_multiset<>::unordered_multiset(_InputIterator, _InputIterator
 Â Â Â  , size_type, const hasher&, const allocator_type&)): Likewise.
 Â Â Â  (unordered_multiset<>::insert(_InputIterator, _InputIterator)):
 Â Â Â  Likewise.

Tested under Linux x86_64.

Ok to commit ?

François


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