unordered_map.h (unordered_map<>): Prefer aggregation to inheritance with _Hashtable.

unordered_map.h (unordered_map<>): Prefer aggregation to inheritance with _Hashtable.

2012-10-27  François Dumont  <fdumont@gcc.gnu.org>

	* include/bits/unordered_map.h (unordered_map<>): Prefer
	aggregation to inheritance with _Hashtable.
	(unordered_multimap<>): Likewise.
	* include/bits/unordered_set.h
	(unordered_set<>(const unordered_set&)):  Use default
	implementation.
	(unordered_set<>(unordered_set&&)): Likewise.
	(unordered_set<>::operator=(const unordered_set&)): Likewise.
	(unordered_set<>::operator=(unordered_set&&)): Likewise.
	(unordered_multiset<>(const unordered_multiset&)): Likewise.
	(unordered_multiset<>(unordered_multiset&&)): Likewise.
	(unordered_multiset<>::operator=(const unordered_multiset&)):
	Likewise.
	(unordered_multiset<>::operator=(unordered_multiset&&)): Likewise.
	* include/debug/unordered_map (operator==): Adapt.
	* include/profile/unordered_map (operator==): Adapt.

From-SVN: r192876