Function benchmark_job_material_kernel 

pub fn benchmark_job_material_kernel(
    nonce_prefix: [b32; 6],
    index: b64,
) -> BenchmarkJobMaterial

Construct one deterministic benchmark job.

Nonce register word zero contributes bytes zero through three, least significant byte first. The final eight seed bytes are the index in network (big-endian) order. The message is an injective bytewise domain transform of the seed; it is test data, not an application prehash construction.