I just want to point out that LLVM is not a runtime dependency. It is only a build-time dependency if you want to build LJR from source. Once LJR is built, it is stand-alone and does not need LLVM at runtime.
It should be a build time dependency. There's no JIT here, so there's no calling into LLVM's JIT, so I'd hope it's equivalent to using clang to create a native binary that implements the lua language.
Could probably retarget it to emit assembly and commit that for a loose interpretation of building from source.