Implementing a cooling-off list in the heap

[Dan Kegel]

Valgrind has a nice option --freelist_vol which is the
total size of blocks to hold on the freed block queue.
It does this to help detect double free errors.

Where in Wine's heap would one want to keep a free list
like that?   My first idea is to just add another element
to the freeList array; rather than putting freed blocks
into the normal element by size, they'd all go into
the purgatory element until it filled up, after which
they would be transferred to the normal free list according
to their size.

(Now off to ride the new light rail.  In Los Angeles, any time
they open a new one, it's cause for celebration... you kinda
have to go there and see if some of the improbability will
rub off on you.)