[Bug middle-end/67649] trunk build with valgrind fail in get_def_blocks_for

[trippels at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=67649

--- Comment #6 from Markus Trippelsdorf <trippels at gcc dot gnu.org> ---
I guess valgrind just needs to be silenced in this case.
See valgrind related macros in gcc/system.h.