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

[rearnsha at gcc dot gnu.org]

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

--- Comment #2 from Richard Earnshaw <rearnsha at gcc dot gnu.org> ---
> will *always* construct a -march string for the driver
                                                  ^^^^^^
for the compiler proper