[Bug c/122572] [15/16 regression] Segmentation fault on aarch64 building with -O2, no issue with -O2 -fschedule-insns

[sjames at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=122572

--- Comment #11 from Sam James <sjames at gcc dot gnu.org> ---
This might explain https://bugs.gentoo.org/964040 as well which I hadn't had
time to debug yet.