[v3] __pool_alloc rework

[Benjamin Kosnik]

Hey Paolo. Here's another way to do __pool_alloc. This exports two
protected member functions, which seems fine to me. Let me know what you
think.

I'm still working on the locking bits, which is the only part of this
patch that I'm unhappy with at the moment. I'd like to check this in
anyway, and continue work on that part along with mt_alloc and the fix
to 13583.

tested x86/linux

-benjamin
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