feat(tvix/eval): Add initial benchmarking infrastructure

Bootstrap some (initially very simple, mostly proof-of-concept)
benchmarking infrastructure using Criterion, using the newly-exposed lib
from tvix-eval.

Change-Id: I4bb93c142ba8d018d7e67e58ac8907a0429398a5
Reviewed-on: https://cl.tvl.fyi/c/depot/+/6156
Reviewed-by: tazjin <tazjin@tvl.su>
Tested-by: BuildkiteCI
Autosubmit: grfn <grfn@gws.fyi>

tvix/eval/Cargo.lock

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tvix/eval/Cargo.toml

@@ -9,9 +9,14 @@ edition = "2021"
 rnix = "0.10.2"
 
 [dev-dependencies]
+criterion = "0.3.6"
 test-generator = "0.3.0"
 
 [features]
 # Enables running the Nix language test suite from the original C++
 # Nix implementation (at version 2.3) against Tvix.
 nix_tests = []
+
+[[bench]]
+name = "eval"
+harness = false

tvix/eval/benches/eval.rs

@@ -0,0 +1,9 @@
+use criterion::{black_box, criterion_group, criterion_main, Criterion};
+use tvix_eval::interpret;
+
+fn eval_literals(c: &mut Criterion) {
+    c.bench_function("int", |b| b.iter(|| black_box(interpret("42"))));
+}
+
+criterion_group!(benches, eval_literals);
+criterion_main!(benches);