Complete support for Wasm GC

[saulecabrera]

I'm currently using waffle to build a toolchain which will target Wasm GC; however, I noticed that support for this proposal is not fully complete. Is this a feature for which you'd be willing to accept pull requests?

Aside from GC, waffle is working great for my use-case, so thanks! As I started adopting it though, I realized that some of the frontend bits are only visible to the crate; is that an intentional design decision? For my use-case I ended up building a generic builder on top of the IR bits inspired on the frontend bits (and Simple And Efficient Construction of SSA Form). I was wondering if providing public APIs à la Cranelift would be something that you'd be interested in?

I'm mixing apples and oranges here, so happy to open a different issue for the builder API if preferred.

[cfallin]

Greetings @saulecabrera (hope all's well!) -- yes to both: (i) I'm happy to take PRs to add Wasm GC instructions and types (no reason they don't exist yet except that I haven't needed them); and (ii) I think it's a great idea to expose an SSA builder interface as well.

Thanks!