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6a02bb7c2b
The two classes always have a 1:1 or 0:1 relationship, and
so we can just move all the members of memory_hard_limit
into region_group, with the functions that track the relationship
(memory_hard_limit::{add,del}()) removed.
The 0:1 relationship is maintained by initializing the
hard limit parameter with std::numeric_limits<size_t>::max().
The _hard_total_memory variable is always checked if it is
greater than this parameter in order to do anything, and
with this default it can never be.