i#295 cont'd: + during heap walk, consider as heap sub-region even if no   live blocks there yet
i#295 cont'd:
+ during heap walk, consider as heap sub-region even if no
  live blocks there yet

git-svn-id: fe3cd4388a6e5a968b09397a3d721fe124e8117a@208 5b54908e-ead4-fc18-b48a-0285e6dbc711

rnk/drmemory,rnk/drmemory,rnk/drmemory,rnk/drmemory