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Roc rewrites the compiler in Zig

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Specifically, it needs to be split into multiple different steps, on top of which the current implementation has accumulated so much cruft that we'd discussed a rewrite of that section just to make it easier to work on. Apparently this has added about 5% to Zig's LLVM code gen times, but in the long run they (and we) can cache portions of bitcode, which can shift it to a net performance improvement compared to the status quo. Development backend: We currently do direct machine code generation (bypassing LLVM for a faster feedback loop), but now that we've seen what kind of performance that approach gets in practice, we want to try doing an interpreter instead.

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