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if configured for the allocator. This was not implemented
and pooled_tree always used address order first fit.
The "problem" was as a carrier can be part of both the pooled tree
(of its owner) and the allocation tree (of a foreign instance)
at the same time. Solved by duplicating 'birth_time' in both
AOFF_RBTree_t nodes for each carrier.
Blocks still cannot use age order and does not pay
any memory cost for birth_time.
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into 'sverker/maint-19/alloc-n-migration/ERIERL-88'
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ageffcaoff: Age First Fit Carrier, Address Order First Fit (within carrier)
ageffcbf : Age First Fit Carrier, Best Fit (within carrier)
ageffcaobf: Age First Fit Carrier, Address Order Best Fit (within carrier)
Prefer old carriers, the older the better.
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In preparation for carrier age order.
Change 'flavor' to 'blk_order' and 'crr_order'.
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* Give back carrier to owner when put in pool with use of dd-queue.
* Replace pooled_list with pooled_tree for more efficient search
of all owned pooled carriers.
* Remove traitor_list as it does not serve much purpose anymore.
* Add HOMECOMING bit flag in crr->allctr atomic to
(1) avoid double enqueue into dd-enqueue.
(2) trigger read barrier in get_used_allctr for newly received carriers.
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* sverk/aoffcbf:
erts: Make aoffcbf default when migration is enabled
erts: Add new allocator strategy aoffcbf
OTP-11174
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with better performance than aoffcaobf as we don't have to rearrange
the search tree when there are blocks of equal size.
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and add new callbacks add_mbc(), remove_mbc() and largest_fblk_in_mbc()
for carrier migration.
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by putting blocks from different carrier into separate search trees.
Carriers are currently organized in a naive linked list by address order.
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