fixes issue 1001
fixes issue 1001

Don't pass native mallocs to client during HeapDestroy handling

git-svn-id: fe3cd4388a6e5a968b09397a3d721fe124e8117a@1002 5b54908e-ead4-fc18-b48a-0285e6dbc711

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