Add note about regalloc2 switch in release notes.
@@ -6,6 +6,11 @@ Unreleased.
### Added
+* Updated Cranelift to use regalloc2, a new register allocator. This should
+ result in ~20% faster compile times, and for programs that suffered from
+ register-allocation pressure before, up to ~20% faster generated code.
+ [#3989](https://github.com/bytecodealliance/wasmtime/pull/3989)
+
* Pre-built binaries for macOS M1 machines are now available as release
artifacts.
[#3983](https://github.com/bytecodealliance/wasmtime/pull/3983)
