valgrind/kcachegrind integration patch

[Alexander Dymo]

Hi!
Our valgrind plugin still wants the user to run "calltree" executable to
produce output to feed the kcachegrind. But modern versions of
valgrind (>=3.2) include that functionality already and instead of calltree
"valgrind --tool=callgrind" should be used. Also we shall expect another
output filename (callgrind.out.pid).
I'm including the patch to fix the issue.

Is it ok to commit?
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