[cachegrind] ported cachegrind improvements patch from valgrind 3.7

Signed-off-by: Juha Kallioinen <juha.kallioinen@jolla.com>
[helgrind] add glibc 2.34567 NPTL race suppression rule

Signed-off-by: Juha Kallioinen <juha.kallioinen@jolla.com>
[valgrind] apply stat_h patch from valgrind 3.7.0

Signed-off-by: Juha Kallioinen <juha.kallioinen@jolla.com>
[coregrind] Fix for ARM thumb compilation

This fix originates from https://bugs.kde.org/show_bug.cgi?id=247978

Signed-off-by: Juha Kallioinen <juha.kallioinen@jolla.com>