[Bug ipa/78494] Issues pointed out by valgrind --tool=exp-dhat

[trippels at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=78494

--- Comment #1 from Markus Trippelsdorf <trippels at gcc dot gnu.org> ---
Beware that it take over an hour to run valgrind in this case.