protoboeuf benchmark fails with `bytesplice': wrong number of arguments (given 5, expected 2..3) (ArgumentError)

[eregon]

From Shopify/yjit-bench#325 (comment)

Probably an easy fix.

We should re-enable the benchmark in yjit-bench once this is fixed (https://github.com/Shopify/yjit-bench/pull/325/files#diff-faff1af3d8ff408964a57b2e475f69a6b7c7b71c9978cccc8f471798caac2c88).