Function cpp_vm_address_region_create_sub_vmar 

pub unsafe extern "C" fn cpp_vm_address_region_create_sub_vmar(
    vmar: *mut VmAddressRegion,
    offset: usize,
    size: usize,
    align_pow2: u8,
    vmar_flags: u32,
    name: *const c_char,
    out_status: *mut zx_status_t,
) -> *mut VmAddressRegion