Add serde-1.0.219-threads4 benchmark for the parallel frontend

collector/compile-benchmarks/REUSE.toml

@@ -220,6 +220,11 @@ path = "serde-1.0.219-new-solver/**"
 SPDX-FileCopyrightText = "serde contributors"
 SPDX-License-Identifier = "MIT OR Apache-2.0"
 
+[[annotations]]
+path = "serde-1.0.219-threads4/**"
+SPDX-FileCopyrightText = "serde contributors"
+SPDX-License-Identifier = "MIT OR Apache-2.0"
+
 [[annotations]]
 path = "serde_derive-1.0.219/**"
 SPDX-FileCopyrightText = "serde contributors"

collector/compile-benchmarks/serde-1.0.219-threads4/.cargo_vcs_info.json

@@ -0,0 +1,6 @@
+{
+  "git": {
+    "sha1": "49d098debdf8b5c38bfb6868f455c6ce542c422c"
+  },
+  "path_in_vcs": "serde"
+}

collector/compile-benchmarks/serde-1.0.219-threads4/0-println.patch

@@ -0,0 +1,12 @@
+diff --git a/src/de/value.rs b/src/de/value.rs
+index 8f9c0b48..2402c9ec 100644
+--- a/src/de/value.rs
++++ b/src/de/value.rs
+@@ -37,6 +37,7 @@ macro_rules! impl_copy_clone {
+
+         impl<$($lifetime,)* E> Clone for $ty<$($lifetime,)* E> {
+             fn clone(&self) -> Self {
++                println!();
+                 *self
+             }
+         }

collector/compile-benchmarks/serde-1.0.219-threads4/Cargo.toml

@@ -0,0 +1,86 @@
+# THIS FILE IS AUTOMATICALLY GENERATED BY CARGO
+#
+# When uploading crates to the registry Cargo will automatically
+# "normalize" Cargo.toml files for maximal compatibility
+# with all versions of Cargo and also rewrite `path` dependencies
+# to registry (e.g., crates.io) dependencies.
+#
+# If you are reading this file be aware that the original Cargo.toml
+# will likely look very different (and much more reasonable).
+# See Cargo.toml.orig for the original contents.
+
+[package]
+edition = "2018"
+rust-version = "1.31"
+name = "serde"
+version = "1.0.219"
+authors = [
+    "Erick Tryzelaar <erick.tryzelaar@gmail.com>",
+    "David Tolnay <dtolnay@gmail.com>",
+]
+build = "build.rs"
+autolib = false
+autobins = false
+autoexamples = false
+autotests = false
+autobenches = false
+description = "A generic serialization/deserialization framework"
+homepage = "https://serde.rs"
+documentation = "https://docs.rs/serde"
+readme = "crates-io.md"
+keywords = [
+    "serde",
+    "serialization",
+    "no_std",
+]
+categories = [
+    "encoding",
+    "no-std",
+    "no-std::no-alloc",
+]
+license = "MIT OR Apache-2.0"
+repository = "https://github.com/serde-rs/serde"
+
+[package.metadata.docs.rs]
+features = [
+    "derive",
+    "rc",
+    "unstable",
+]
+rustdoc-args = [
+    "--generate-link-to-definition",
+    "--extern-html-root-url=core=https://doc.rust-lang.org",
+    "--extern-html-root-url=alloc=https://doc.rust-lang.org",
+    "--extern-html-root-url=std=https://doc.rust-lang.org",
+]
+targets = ["x86_64-unknown-linux-gnu"]
+
+[package.metadata.playground]
+features = [
+    "derive",
+    "rc",
+]
+
+[features]
+alloc = []
+default = ["std"]
+derive = ["serde_derive"]
+rc = []
+std = []
+unstable = []
+
+[lib]
+name = "serde"
+path = "src/lib.rs"
+
+[dependencies.serde_derive]
+version = "1"
+optional = true
+
+[dev-dependencies.serde_derive]
+version = "1"
+
+[target."cfg(any())".dependencies.serde_derive]
+version = "=1.0.219"
+
+[workspace]