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This version actually works (in both normal and debug
builds).  It adds some stats which are useful and updates
Misc/SpecialBuilds.txt.

I modified to not preallocate and only hold a ref when the
function didn't keep a ref.

I still need to inline more of PyCFunction_Call.  Speed is
still the same as before.

I'm not sure if I'll finish this before the sprint next
week.  Anyone there feel free to check this in if you finish it.