[v3] saner defaults for __per_pool_pool_policy's __pool_type

[Benjamin Kosnik]

... as per commentary in libstdc++/16614. 

All I'm going for are sane defaults that fix the glaring issues.
Specific tuning is already possible with __pool_base member functions.

I believe this fixes up the last of the known issues. I'd like to do
another round of performance tuning on this sucker now that these other
issues have been addressed.

tested x86/linux

-benjamin

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