Helgrind : two new gdbserver commands 'describe address' and 'info locks'
  - Helgrind GDB server monitor command 'describe <address>'
    allowing to describe an address (e.g. where it was allocated).
  - Helgrind GDB server monitor command 'info locks' giving
    the list of locks, their location, and their status.

In a further patch, it is intended to
  1. factorise the describe address code between memcheck and helgrind
  2. generalise the describe address gdbsrv command so as to make
     it usable for all tools.



git-svn-id: svn://svn.valgrind.org/valgrind/trunk@13930 a5019735-40e9-0310-863c-91ae7b9d1cf9