Switch to LLVM

[rtulip]

Rather than generating assembly, Haystack should instead generate LLVM ir.

Unresolved questions:

• [ ] - Creating a stack in LLVM
• [ ] - How to do file operations (and other things that syscall is currently used for)

[rtulip]

This might help with creating a stack: https://github.com/riywo/llforth

[kevinbarabash]

Is Cranelift an option as well or do you need proper support for tail calls?

[rtulip]

Is Cranelift an option as well or do you need proper support for tail calls?

I've not worked with either, but as far as I understand, cranelift would also work.

[kevinbarabash]

I haven't used Cranelift, but it seems like it might easier to integrate given it's written in Rust.

[rtulip]

That is a good point. I had been planning on generating LLVM assembly, but being able to do the code gen in source may be nice.