<flat_map>: Ensure different flat_(multi)map specializations don't share nested types (remove speculative implementation of LWG-3963)
#5988
+34
−43
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Move definitions of nested types
containersandvalue_compareinto the_Flat_map_base.If this solution is not preferable, the alternative is to add an owner-tag type to the previously used
xxx_providers.Fixes #5965