Add html5ever-0.31.0-new-solver benchmark

Author: Kobzol

collector/compile-benchmarks/html5ever-0.31.0-new-solver/.cargo_vcs_info.json

@@ -0,0 +1,6 @@
+{
+  "git": {
+    "sha1": "ce481196ff2e60eb536d9c022f4ca00bd5181f15"
+  },
+  "path_in_vcs": "html5ever"
+}

collector/compile-benchmarks/html5ever-0.31.0-new-solver/0-println.patch

@@ -0,0 +1,12 @@
+diff --git a/src/util/str.rs b/src/util/str.rs
+index 2c0ec3e2..a78ff669 100644
+--- a/src/util/str.rs
++++ b/src/util/str.rs
+@@ -10,6 +10,7 @@
+ use std::fmt;
+ 
+ pub(crate) fn to_escaped_string<T: fmt::Debug>(x: &T) -> String {
++    println!("testing");
+     // FIXME: don't allocate twice
+     let string = format!("{x:?}");
+     string.chars().flat_map(|c| c.escape_default()).collect()