Specialize String#byteslice(a, b) (#9939)

* Specialize String#byteslice(a, b)

This adds a specialization for String#byteslice when there are two
parameters.

This makes our protobuf parser go from 5.84x slower to 5.33x slower

```
Comparison:
decode upstream (53738 bytes):     7228.5 i/s
decode protobuff (53738 bytes):     1236.8 i/s - 5.84x  slower

Comparison:
decode upstream (53738 bytes):     7024.8 i/s
decode protobuff (53738 bytes):     1318.5 i/s - 5.33x  slower
```

* Update yjit/src/codegen.rs

---------

Co-authored-by: Maxime Chevalier-Boisvert <[email protected]>

1 files changed, 1 insertions, 0 deletions

diff --git a/yjit/src/cruby_bindings.inc.rs b/yjit/src/cruby_bindings.inc.rs
index f0644edaf3..54cd51b61e 100644
--- a/yjit/src/cruby_bindings.inc.rs
+++ b/yjit/src/cruby_bindings.inc.rs
@@ -1049,6 +1049,7 @@ extern "C" {
     pub fn rb_gvar_set(arg1: ID, arg2: VALUE) -> VALUE;
     pub fn rb_ensure_iv_list_size(obj: VALUE, len: u32, newsize: u32);
     pub fn rb_vm_barrier();
+    pub fn rb_str_byte_substr(str_: VALUE, beg: VALUE, len: VALUE) -> VALUE;
     pub fn rb_obj_as_string_result(str_: VALUE, obj: VALUE) -> VALUE;
     pub fn rb_str_concat_literals(num: usize, strary: *const VALUE) -> VALUE;
     pub fn rb_ec_str_resurrect(ec: *mut rb_execution_context_struct, str_: VALUE) -> VALUE;