How to get callgrind to work in older Rocks

in rocks the ruby script that fires the simulation
search for valgrind and at the end of the file,

elsif @@valgrind # uses fast bochs
        system("valgrind --leak-check=yes "+@@root+"/bochs/"+BochsConfig.binName +
               " "+BochsConfig.getCommandLineOptions)
This will have the valgrind work with leak-check

but if we change the leak-chcek with --tool=callgrind, it should work with callgrind.

To see the call graph, use
kcachegrind callgrind.out.14912

kcachegrind is already installed in the csl machines.