[Bug target/83514] ABRT in arm_declare_function_name passing a null pointer to std::string

[prathamesh3492 at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=83514

--- Comment #6 from prathamesh3492 at gcc dot gnu.org ---
Committed patch to conditionally set arch_to_print after Kyrill's approval.

Thanks,
Prathamesh