Add helloworld-tiny benchmark

collector/benchmarks/README.md

@@ -79,6 +79,8 @@ compiler in interesting ways.
   the past.
 - **derive**: A large number of simple structs with a `#[derive]` attribute for common built-in traits such as Copy and Debug.
 - **externs**: A large number of extern functions has caused [slowdowns in the past](https://github.com/rust-lang/rust/pull/78448).
+- **helloworld-tiny**: A trivial program optimized with flags that should reduce binary size.
+  Gives a lower bound on compiled binary size.
 - **issue-46449**: A small program that caused [poor
   performance](https://github.com/rust-lang/rust/issues/46449) in the past.
 - **issue-58319**: A small program that caused [poor

collector/benchmarks/helloworld-tiny/Cargo.toml

@@ -0,0 +1,15 @@
+[package]
+name = "helloworld-tiny"
+version = "0.1.0"
+edition = "2021"
+
+[dependencies]
+
+[workspace]
+
+[profile.release]
+opt-level = "z"
+lto = true
+codegen-units = 1
+panic = "abort"
+strip = true

collector/benchmarks/helloworld-tiny/perf-config.json

@@ -0,0 +1,5 @@
+{
+    "category": "secondary",
+    "excluded_profiles": ["Doc", "Check", "Debug"],
+    "excluded_scenarios": ["IncrFull", "IncrPatched", "IncrUnchanged"]
+}

collector/benchmarks/helloworld-tiny/src/main.rs

@@ -0,0 +1,3 @@
+fn main() {
+    println!("Hello world!");
+}