use safe_read for all leak de-refs when mem query unreliable and do not have definedness info to avoid crashing
use safe_read for all leak de-refs when mem query unreliable and do not
have definedness info to avoid crashing

git-svn-id: fe3cd4388a6e5a968b09397a3d721fe124e8117a@77 5b54908e-ead4-fc18-b48a-0285e6dbc711

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