Yes, I guess?: Cranelift, which is a LLVM-like library written in Rust. This could be used for faster debug builds in the future. There's a Rust backend using Cranelift [2].

If you mean addressing the poor quality of LLVM IR directly, then I don't know.

[1]: https://github.com/bytecodealliance/wasmtime/blob/main/crane... [2]: https://github.com/bjorn3/rustc_codegen_cranelift