--fill-free=<hexnumber>, which cause malloc'd(etc) and free'd(etc)
blocks to be filled with the specified value. This can apparently be
useful for shaking out hard-to-track-down memory corruption. The
definedness/addressability of said areas is not affected -- only the
contents. Documentation to follow.
git-svn-id: svn://svn.valgrind.org/valgrind/trunk@7259
