Add syn-1.0.89 additional scaffolding

Timings:
*syn:
  * check: 1.64s
  * build: 1.91s
  * build --release: 2.87s
* syn-1.0.89 (full/final):
  * check: 1.97s/1.22s
  * build: 2.89s/2.01s
  * build --release: 4.65s/3.99s

Author: rylev

collector/benchmarks/README.md

@@ -40,7 +40,7 @@ They mostly consist of real-world crates.
 - **serde**: A serialization/deserialization crate. Used by many other
   Rust programs.
 - **stm32f4**: A crate that has many thousands of blanket impl blocks.
-- **syn**: A library for parsing Rust code. An important part of the Rust
+- **syn-1.0.89**: A library for parsing Rust code. An important part of the Rust
   ecosystem.
 - **unicode_normalization**: Unicode character composition and decomposition
   utilities. Uses huge `match` statements that stress the compiler in unusual
@@ -141,6 +141,6 @@ Rust code being written today.
 - **piston-image**: See above.
 - **style-servo**: An old version of Servo's `style` crate. A large crate, and
   one used by old versions of Firefox.
-- **syn**: See above.
+- **syn**: See above. This is an older version (0.11.11) of the crate.
 - **tokio-webpush-simple**: A simple web server built with a very old version
   of tokio. Uses futures a lot, but doesn't use `async`/`await`.

collector/benchmarks/syn-1.0.89/0-println.patch

@@ -0,0 +1,12 @@
+diff --git a/src/lifetime.rs b/src/lifetime.rs
+index 5dc1753a..61f28dde 100644
+--- a/src/lifetime.rs
++++ b/src/lifetime.rs
+@@ -37,6 +37,7 @@ impl Lifetime {
+     /// # }
+     /// ```
+     pub fn new(symbol: &str, span: Span) -> Self {
++        println!("testing");
+         if !symbol.starts_with('\'') {
+             panic!(
+                 "lifetime name must start with apostrophe as in \"'a\", got {:?}",

collector/benchmarks/syn-1.0.89/Cargo.toml

@@ -135,3 +135,5 @@ proc-macro = [
 test = ["syn-test-suite/all-features"]
 visit = []
 visit-mut = []
+
+[workspace]