message: Add black_box to get_instance results
diff: -use criterion::{criterion_group, criterion_main, Criterion};
  +use criterion::{black_box, criterion_group, criterion_main, Criterion};
  use std::time::{Duration, SystemTime};
  use tempfile::TempDir;
  @@ -248,13 +248,15 @@ pub fn bench_instance_threads(c: &mut Criterion) {
  let checksum = checksum;
  // Perform measurement internally
  let t = SystemTime::now();
  - let _instance = cache
  + black_box(
  + cache
  .get_instance(
  &checksum,
  mock_backend(&[]),
  DEFAULT_INSTANCE_OPTIONS,
  )
  - .unwrap();
  + .unwrap(),
  + );
  t.elapsed().unwrap()
  })
  })
  