add code to track number of allocations of each size.
add code to track number of allocations of each size.

darcs-hash:20080313114637-1a7c6-7f4a0ca22ce8497c1041dba7cc74d7bc2f2bd9f9

jimcrayne/jhc,jimcrayne/jhc,jimcrayne/jhc,jimcrayne/jhc