François Dumont 1354603bf7 libstdc++: [_GLIBCXX_DEBUG] Avoid allocator operator== when always equal
Use std::allocator_traits::is_always_equal to find out if we need to compare
allocator instances on safe container allocator aware move constructor.

libstdc++-v3/ChangeLog:

	* include/debug/safe_container.h
	(_Safe_container(_Safe_container&&, const _Alloc&, std::true_type)): New.
	(_Safe_container(_Safe_container&&, const _Alloc&, std::false_type)): New.
	(_Safe_container(_Safe_container&&, const _Alloc&)): Use latters.
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..
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map
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set
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