[Bug ipa/65432] [5 Regression] Invalid read of size 1: ipa_icf::sem_item_optimizer::merge_classes(unsigned int) (ipa-icf.c:2958)

[trippels at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=65432

--- Comment #1 from Markus Trippelsdorf <trippels at gcc dot gnu.org> ---
To reproduce:
trippels@gcc2-power8 testsuite % ~/gcc_valgrind/usr/local/bin/g++ -c -O2
-fdump-ipa-icf -fno-inline g++.dg/ipa/ipa-icf-4.C