re PR libstdc++/54075 ([4.7.1] unordered_map insert still slower than 4.6.2)

re PR libstdc++/54075 ([4.7.1] unordered_map insert still slower than 4.6.2)

2012-07-25  François Dumont  <fdumont@gcc.gnu.org>

	PR libstdc++/54075
	* include/bits/hashtable.h
	(_Hashtable<>::_Hashtable(_InputIterator, _InputIterator,
	size_type, ...): Remove std::max usage to guarantee that hashtable
	state is consistent with hash policy state.
	(_Hashtable<>::rehash): Likewise. Set _M_prev_resize to 0 to avoid
	the hashtable to be shrinking on next insertion.
	* testsuite/23_containers/unordered_set/modifiers/reserve.cc: New.
	* testsuite/23_containers/unordered_multiset/modifiers/reserve.cc: New.
	* testsuite/23_containers/unordered_map/modifiers/reserve.cc: New.
	* testsuite/23_containers/unordered_multimap/modifiers/reserve.cc: New.

From-SVN: r189863