misc memusage category too large: split it up

_From [bruen...@google.com](https://code.google.com/u/109494838902877177630/) on December 14, 2010 15:12:37_

for base_unittests and also for equake
e.g.:
Heap usage:
shadow: count= 492, cur= 8364 KB, max= 8364 KB
perbb: count= 20808, cur= 325 KB, max= 1352 KB
callstack: count= 13476, cur= 732 KB, max= 2960 KB
hashtable: count= 118207, cur= 2588 KB, max= 3281 KB
gencode: count= 1, cur= 44 KB, max= 44 KB
rbtree: count= 8082, cur= 252 KB, max= 252 KB
misc: count= 334, cur= 178 KB, max= 3327 KB
not sure what's in there that's so big

_Original issue: http://code.google.com/p/drmemory/issues/detail?id=242_