On some Aarch64 CPUs (like the dev desktops), [`host_detect_local_cpu` with `params[] = { "arch" }`](https://github.com/rust-lang/gcc/blob/b93730ce97c738bdb9209aa973d3fc6fd4ce1d81/gcc/config/aarch64/aarch64-jit.cc#L44) returns `NULL` whereas `host_detect_local_cpu` with `params[] = { "cpu" }` returns a value.