[Bug lto/90523] lto1 segfault in arm_parse_cpu_option_name

[amonakov at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=90523

--- Comment #2 from Alexander Monakov <amonakov at gcc dot gnu.org> ---
See also PR 87076, which has a reduced testcase and some root-cause analysis
(likely a duplicate).